Glossary of Health Terms
A
- Abdomen: The part of the body containing digestive organs.
- Abdominal Aortic Aneurysm: A bulging or swelling in the aorta, the main blood vessel supplying blood to the abdomen, pelvis, and legs.
- Abortion: The medical termination of a pregnancy.
- Abscess: A localized collection of pus in tissues, organs, or confined spaces in the body.
- Acetaminophen: A common pain reliever and fever reducer.
- Acid Reflux: A condition where stomach acid frequently flows back into the esophagus.
- Acidosis: An excessively acidic condition of the body fluids or tissues.
- Acne Vulgaris: A skin condition characterized by blackheads, whiteheads, and inflamed pimples.
- Acquired Immunity: Immunity gained after exposure to an antigen.
- Acromegaly: A hormonal disorder caused by too much growth hormone.
- Acute Disease: A disease with a rapid onset and/or a short course.
- Addison's Disease: A disorder where adrenal glands produce insufficient hormones.
- Adenitis: Inflammation of a gland, especially a lymph node.
- Adenocarcinoma: A type of cancer that forms in mucus-secreting glands.
- Adenoma: A non-cancerous tumor in glandular structures of epithelial tissue.
- Adenosine Triphosphate (ATP): The primary carrier of energy in cells.
- Adipose Tissue: Connective tissue in which fat is stored.
- Adjuvant Therapy: Additional cancer treatment given after the primary treatment.
- Adrenal Glands: Small glands above the kidneys that produce hormones like adrenaline.
- Adrenaline: A hormone released during stress that increases heart rate and energy.
- Adrenocorticotropic Hormone (ACTH): Stimulates cortisol production in adrenal glands.
- Adult-Onset Diabetes: Another term for Type 2 Diabetes.
- Advance Directive: A legal document outlining medical treatment preferences.
- Aerosol: A suspension of fine particles or droplets in air or gas.
- Aflatoxin: A toxin produced by fungi that can contaminate crops.
- Afterbirth: The placenta and fetal membranes discharged after childbirth.
- Agglutination: Clumping of particles, often seen in blood typing.
- Agnosia: Inability to process sensory information properly.
- Agranulocytosis: A deficiency of certain white blood cells, leading to infection risk.
- AIDS (Acquired Immunodeficiency Syndrome): A severe immune system disorder caused by HIV.
- Air Embolism: Blockage in a blood vessel caused by air bubbles.
- Airway: The passage that allows air into and out of the lungs.
- Albumin: A protein made by the liver that helps maintain blood volume and pressure.
- Alcoholism: Chronic disease involving uncontrolled drinking behavior.
- Aldosterone: A hormone that helps regulate blood pressure and fluid balance.
- Allergen: A substance that triggers an allergic reaction.
- Allergy: Immune response to a normally harmless substance.
- Alopecia: Sudden or gradual hair loss.
- Alveoli: Tiny lung sacs where gas exchange occurs.
- Alzheimer's Disease: A progressive disease that destroys memory and mental function.
- Ambulance: Emergency vehicle used for transporting patients to hospitals.
- Amenorrhea: Absence of menstrual periods.
- Amniocentesis: Prenatal test involving sampling of amniotic fluid.
- Amniotic Fluid: Fluid surrounding the fetus in the womb.
- Amputation: Surgical removal of a limb or extremity.
- Anabolism: Metabolic process that builds molecules from smaller units.
- Anaphylaxis: A severe, potentially life-threatening allergic reaction.
- Anemia: Condition where red blood cells or hemoglobin are deficient.
- Anesthesia: Drug-induced loss of sensation or consciousness.
- Aneurysm: A balloon-like bulge in a blood vessel wall.
- Angina Pectoris: Chest pain caused by reduced blood flow to the heart.
- Angiogram: Imaging test to view blood vessels.
- Angioplasty: Procedure to widen narrowed arteries.
- Ankylosing Spondylitis: A form of arthritis affecting the spine and large joints.
- Anorexia Nervosa: Eating disorder marked by weight loss and body image distortion.
- Antibiotic: Medicine that inhibits the growth of or destroys bacteria.
- Antibody: A protein produced to counteract a specific antigen.
- Anticoagulant: A substance that prevents blood clotting.
- Antigen: A molecule capable of inducing an immune response.
- Antihistamine: A drug used to relieve allergy symptoms.
- Antiseptic: A chemical substance that inhibits the growth of microorganisms.
- Anus: Opening at the end of the digestive tract where waste leaves the body.
- Aorta: The main artery carrying blood away from the heart to the rest of the body.
- Aphasia: Loss of ability to understand or express speech.
- Apnea: Temporary cessation of breathing.
- Appendectomy: Surgical removal of the appendix.
- Appendicitis: Inflammation of the appendix, often requiring surgery.
- Arrhythmia: Irregular heartbeat or rhythm.
- Arteriosclerosis: Hardening and thickening of the arteries.
- Artery: A blood vessel that carries blood away from the heart.
- Arthritis: Inflammation of one or more joints, causing pain and stiffness.
- Asthma: A respiratory condition marked by spasms in the bronchi of the lungs.
- Atherosclerosis: A buildup of fats, cholesterol, and other substances in artery walls.
- Atrophy: The wasting away or decrease in size of an organ or tissue.
- Autism Spectrum Disorder: A developmental disorder affecting communication and behavior.
- Autoimmune Disease: A disease where the immune system attacks the body's own cells.
- Axon: The long part of a nerve cell that carries impulses away from the cell body.
B
- Bacteria: Single-celled organisms, some of which can cause disease, while others are beneficial.
- Bacteremia: Presence of bacteria in the bloodstream, potentially causing serious infection.
- Bactericide: A substance that kills bacteria.
- Balance Disorder: Condition that makes a person feel unsteady or dizzy due to inner ear problems.
- Basal Cell Carcinoma: A common type of skin cancer that arises from basal cells in the skin.
- Basal Metabolic Rate (BMR): The number of calories your body needs to maintain basic functions at rest.
- Benign: Not harmful in effect; in particular, not cancerous.
- Benign Prostatic Hyperplasia (BPH): Noncancerous enlargement of the prostate gland.
- Benzodiazepines: Medications used to treat anxiety, insomnia, and seizures.
- Beta Blocker: A class of drugs that reduce blood pressure by blocking adrenaline effects.
- Bile: A fluid made by the liver that helps digest fats.
- Biliary Tract: Pathway by which bile is secreted by the liver and carried to the small intestine.
- Biopsy: A procedure to remove a small sample of tissue for testing or diagnosis.
- Bipolar Disorder: A mental health condition marked by extreme mood swings between depression and mania.
- Birth Defect: A structural or functional abnormality present at birth.
- Bladder: A muscular sac in the pelvis that stores urine.
- Bleeding Disorder: A condition that affects the way blood normally clots.
- Blood Clot: A gel-like mass formed by platelets and fibrin to stop bleeding.
- Blood Count: A lab test to measure different components of blood like red and white cells.
- Blood Glucose: Sugar found in the blood, an essential energy source.
- Blood Pressure: The force of circulating blood on the walls of the arteries.
- Blood Transfusion: The process of transferring blood or blood products into a person's circulation.
- Body Mass Index (BMI): A measure of body fat based on height and weight.
- Bone Density Test: A test that measures the strength of your bones.
- Bone Marrow: The soft tissue inside bones that produces blood cells.
- Botulism: A rare but serious illness caused by a toxin that attacks the body’s nerves.
- Bradycardia: A slower than normal heart rate (typically under 60 beats per minute).
- Brainstem: The part of the brain that controls breathing, heartbeat, and other basic functions.
- Breast Cancer: A disease in which malignant cells form in the tissues of the breast.
- Breastfeeding: Feeding a baby with milk directly from the mother's breast.
- Bronchi: The large air passages that lead from the trachea to the lungs.
- Bronchial Tubes: Air passages inside the lungs that branch off from the bronchi.
- Bronchitis: Inflammation of the lining of the bronchial tubes.
- Bronchodilator: A medication that relaxes muscle bands that tighten around the airways.
- Bruise: An injury appearing as an area of discolored skin caused by bleeding under the skin.
- Bunion: A bony bump that forms on the joint at the base of the big toe.
- Burn: Injury to tissues caused by heat, electricity, chemicals, or radiation.
- Bypass Surgery: A procedure to redirect blood flow around a blocked artery.
- Babesiosis: A rare, malaria-like infection caused by parasites that infect red blood cells, transmitted by ticks.
- Back Pain: Discomfort in the back area that can result from muscle strain, herniated discs, arthritis, or poor posture.
- Balance Test: Diagnostic tests used to determine the cause of balance disorders.
- Barotrauma: Injury caused by a change in air or water pressure, often affecting the ears or lungs.
- Bariatric Surgery: Surgical procedures performed on the stomach or intestines to promote weight loss.
- Bartholin's Cyst: A fluid-filled swelling on the Bartholin's glands, located on each side of the vaginal opening.
- Basal Ganglia: A group of structures in the brain involved in movement control and coordination.
- Becker’s Muscular Dystrophy: A genetic disorder characterized by slowly worsening muscle weakness of the legs and pelvis.
- Behçet's Disease: A rare disorder causing blood vessel inflammation throughout the body.
- Bell's Palsy: A sudden weakness or paralysis of muscles on one side of the face due to nerve inflammation.
- Beta Cells: Cells in the pancreas that produce insulin.
- Bilirubin: A yellow pigment formed by the breakdown of red blood cells; high levels may cause jaundice.
- Bioavailability: The degree and rate at which a drug is absorbed into the bloodstream.
- Biologic Therapy: Treatment using substances made from living organisms to fight disease.
- Biomarker: A measurable indicator of a biological condition or disease.
- Bioterrorism: The intentional release of biological agents to cause illness or death.
- Biphasic Response: A reaction with two phases, often an initial positive and delayed negative effect.
- Birth Control: Methods or devices used to prevent pregnancy.
- Bites and Stings: Injuries from animals or insects that may result in swelling, pain, or allergic reactions.
- Blackhead: A small bump on the skin due to clogged hair follicles (a type of acne).
- Bladder Infection: A type of urinary tract infection (UTI) affecting the bladder.
- Blood Culture: A laboratory test to check for bacteria or other organisms in a blood sample.
- Blood Poisoning (Sepsis): A serious infection that spreads throughout the body via the bloodstream.
- Blue Baby Syndrome: A condition in infants due to poor oxygenation, often from congenital heart defects.
- Body Image: The perception a person has of their physical self and the thoughts and feelings that result from that perception.
- Bonescan: A diagnostic imaging test that helps detect bone diseases and abnormalities.
- Bowel Obstruction: A blockage in the intestine preventing normal digestion or elimination.
- Braces (Orthodontics): Dental devices used to straighten and align teeth.
- Brain Tumor: An abnormal growth of tissue in the brain which can be benign or malignant.
- Breast Self-Exam: A technique for checking one's own breasts for lumps or abnormalities.
- Broken Bone (Fracture): A medical condition where a bone is cracked or broken due to injury or stress.
- Bronchoscopy: A procedure to look directly at the airways using a thin, lighted tube.
- Bruxism: The grinding or clenching of teeth, often during sleep.
C
- Calcium: A mineral essential for strong bones, teeth, muscle function, and nerve signaling.
- Callus: A thickened area of skin caused by repeated friction or pressure.
- Cancer: A group of diseases involving abnormal cell growth with the potential to invade or spread to other parts of the body.
- Canine Teeth: The pointed teeth used for tearing food.
- Cardiac Arrest: A sudden stop in effective blood circulation due to the failure of the heart to contract effectively.
- Cardiology: The medical specialty dealing with diseases and abnormalities of the heart.
- Cardiopulmonary Resuscitation (CPR): An emergency procedure combining chest compressions and artificial ventilation to maintain blood circulation and oxygenation.
- Cardiovascular Disease: A class of diseases that involve the heart or blood vessels, such as coronary artery disease or stroke.
- Carpal Tunnel Syndrome: A condition causing pain, numbness, or tingling in the hand due to pressure on the median nerve in the wrist.
- Cartilage: A flexible connective tissue found in joints, ear, nose, and respiratory tract.
- CAT Scan (CT Scan): A medical imaging technique that uses computer-processed X-rays to produce cross-sectional images of the body.
- Catheter: A thin tube inserted into the body to remove or deliver fluids.
- Cataract: A clouding of the normally clear lens of the eye, leading to blurry vision.
- Celiac Disease: An autoimmune disorder where the ingestion of gluten damages the small intestine.
- Cellulitis: A common, potentially serious bacterial skin infection.
- Cerebellum: The part of the brain that controls motor skills like balance, coordination, and posture.
- Cerebrospinal Fluid (CSF): Clear fluid surrounding the brain and spinal cord, providing cushioning and nutrients.
- Cerebrovascular Accident (Stroke): Occurs when the blood supply to part of the brain is interrupted or reduced, depriving brain tissue of oxygen.
- Cervical Cancer: Cancer that occurs in the cells of the cervix — the lower part of the uterus.
- Cervix: The lower, narrow end of the uterus that connects to the vagina.
- Cesarean Section (C-section): A surgical procedure used to deliver a baby through incisions in the abdomen and uterus.
- Chapped Lips: Dry, cracked, or sore lips often due to cold weather or dehydration.
- Chlamydia: A common sexually transmitted infection (STI) caused by bacteria.
- Chlorophyll: A green pigment found in plants, used in some natural remedies for healing and detoxification.
- Cholesterol: A fatty substance in the blood, essential for building cells but harmful at high levels.
- Chronic Disease: A long-lasting condition that can be controlled but not cured, such as diabetes or hypertension.
- Chronic Fatigue Syndrome: A complex disorder characterized by extreme fatigue not improved by rest.
- Circulatory System: The body system responsible for moving blood, nutrients, and oxygen through the body.
- Cirrhosis: Scarring of the liver caused by long-term liver damage, often due to alcohol or hepatitis.
- Clavicle: The collarbone, connecting the breastbone to the shoulder.
- Clinical Trial: A research study that tests how well new medical approaches work in people.
- Clotting Factor: A protein in blood that helps control bleeding.
- Coagulation: The process by which blood changes from a liquid to a gel, forming a clot.
- Colic: Frequent, prolonged, and intense crying or fussiness in an otherwise healthy infant.
- Colitis: Inflammation of the inner lining of the colon.
- Colon: Part of the large intestine involved in water absorption and waste formation.
- Colonoscopy: An exam used to detect changes or abnormalities in the large intestine (colon) and rectum.
- Coma: A state of deep unconsciousness that lasts for a prolonged or indefinite period.
- Complementary Medicine: Treatments used along with standard medical treatments but not considered standard themselves.
- Concussion: A brain injury caused by a blow to the head or body, shaking of the brain inside the skull.
- Congenital: A condition or trait present at birth, either inherited or caused by the environment.
- Conjunctivitis (Pink Eye): Inflammation or infection of the outer membrane of the eyeball and the inner eyelid.
- Constipation: A condition where bowel movements become less frequent and stools become hard to pass.
- Contagious: Capable of being transmitted from person to person.
- Cornea: The clear, dome-shaped surface that covers the front of the eye.
- Coronary Artery Disease (CAD): A disease caused by the buildup of plaque in the coronary arteries.
- Cortisol: A hormone released by the adrenal glands during stress.
- Cough: A reflex action to clear the airways of mucus, irritants, or foreign particles.
- COVID-19: A contagious respiratory illness caused by the SARS-CoV-2 virus.
- Creatinine: A waste product from muscle metabolism measured to assess kidney function.
- CT Scan (Computed Tomography): An imaging technique that uses X-rays and computer processing to create detailed body images.
- Cyanosis: A bluish discoloration of the skin due to lack of oxygen in the blood.
D
- Dandruff: A common scalp condition that causes flaking of the skin.
- Decubitus Ulcer: Also called a pressure sore or bed sore; an injury to skin and underlying tissue from prolonged pressure.
- Deep Vein Thrombosis (DVT): A blood clot that forms in a deep vein, usually in the legs.
- Decongestant: A type of medication used to relieve nasal congestion.
- Dehydration: A condition caused by excessive loss of body fluids.
- Dementia: A group of symptoms affecting memory, thinking, and social abilities.
- Dengue: A viral infection transmitted by mosquitoes causing fever and joint pain.
- Depression: A mood disorder causing persistent feelings of sadness and loss of interest.
- Dermatitis: Inflammation of the skin, often resulting in a rash or itchiness.
- Diabetes: A metabolic disorder characterized by high blood sugar levels.
- Dialysis: A procedure to remove waste products and excess fluid from the blood when the kidneys stop working properly.
- Diarrhea: Frequent, loose, or watery bowel movements.
- Dietary Fiber: Plant-based nutrients that aid digestion and prevent constipation.
- Digestive System: The system of organs responsible for digestion and absorption of food.
- Disability: A physical or mental condition that limits a person's movements, senses, or activities.
- Dislocation: Displacement of a bone from its normal joint position.
- Dizziness: A sensation of spinning or losing one’s balance.
- Down Syndrome: A genetic disorder caused by the presence of an extra chromosome 21.
- Drug Allergy: An allergic reaction to a medication.
- Dry Eye: A condition where the eyes do not produce enough tears or the right quality of tears.
- Dysentery: Inflammation of the intestine causing diarrhea with blood.
- Dyslexia: A learning disorder characterized by difficulty reading.
- Dyspepsia: Indigestion or discomfort in the upper abdomen.
- Dystonia: A movement disorder causing involuntary muscle contractions.
- Defibrillator: A medical device used to deliver a dose of electric current to the heart in life-threatening cardiac conditions.
- Degenerative Disease: A disease that causes the progressive breakdown of body tissues or functions.
- Delirium: An Acute disturbance in mental abilities that results in confused thinking and reduced awareness of the environment.
- Delusion: A false belief held despite evidence to the contrary, often associated with psychiatric disorders.
- Dental Caries: Also known as tooth decay or cavities, caused by bacterial damage to the teeth.
- Dental Plaque: A sticky, colorless or pale yellow film that constantly forms on teeth.
- Dentures: Removable replacements for missing teeth and surrounding tissues.
- Dermatology: The branch of medicine dealing with the skin and its diseases.
- Detoxification: The process of removing toxic substances from the body.
- Developmental Delay: A condition where a child does not reach developmental milestones at expected times.
- Diabetic Retinopathy: An eye condition that can cause vision loss and blindness in people with diabetes.
- Diagnostic Imaging: Techniques like X-ray, CT, MRI used to view the inside of the body for medical diagnosis.
- Diaphragm: A dome-shaped muscle that plays a major role in breathing, or a form of birth control device.
- Diastolic Pressure: The bottom number in a blood pressure reading, indicating pressure when the heart rests between beats.
- Digital Rectal Exam (DRE): A screening test for prostate and rectal diseases using a gloved finger.
- Diphtheria: A serious bacterial infection affecting the mucous membranes of the nose and throat.
- Distal: An anatomical term meaning farther from the center of the body or point of attachment.
- DNR (Do Not Resuscitate): A medical order to withhold CPR or advanced cardiac life support if the patient’s heart stops.
- Dose: The specific amount of medication or radiation given to a patient.
- Dosage Form: The physical form of a dose of medication, such as tablet, capsule, or liquid.
- Doula: A trained professional who supports a woman before, during, and after childbirth.
- Drainage: The removal of fluid or pus from a wound or body cavity.
- Drug Interaction: A change in the effect of a drug when taken with another drug, food, or substance.
- Duodenum: The first section of the small intestine immediately beyond the stomach.
- Dysarthria: Difficulty in speaking due to problems with the muscles that produce speech.
- Dysmenorrhea: Painful menstruation involving abdominal cramps.
- Dysphagia: Difficulty or discomfort in swallowing.
- Dysplasia: Abnormal development of cells or tissues, often a precancerous condition.
E
- Ear Infection: Inflammation of the middle ear, often caused by bacteria or viruses.
- Earwax: A natural substance that protects the ear canal by trapping dirt and repelling water.
- Echocardiogram: An ultrasound test that uses sound waves to create images of the heart.
- Ecstasy (MDMA): A synthetic drug that alters mood and perception, often abused recreationally.
- Edema: Swelling caused by fluid trapped in the body’s tissues.
- EEG (Electroencephalogram): A test that detects electrical activity in the brain using small electrodes.
- Effusion: An abnormal collection of fluid in a body cavity, such as around the lungs or joints.
- Electrocardiogram (ECG or EKG): A test that records the electrical signals of the heart.
- Electrolytes: Minerals in the body that help balance fluids, such as sodium, potassium, and calcium.
- Embolism: A blockage in a blood vessel caused by a blood clot, air bubble, or fat droplet.
- Emphysema: A chronic lung disease that causes shortness of breath due to damage in air sacs.
- Empyema: A collection of pus in a body cavity, often in the space around the lungs.
- Encephalitis: Inflammation of the brain, usually due to a viral infection.
- Endocrine System: A network of glands that produce and release hormones into the bloodstream.
- Endometriosis: A disorder in which tissue similar to the lining of the uterus grows outside the uterus.
- Endoscopy: A procedure using a thin tube with a camera to examine the inside of the digestive tract.
- Enzyme: A protein that speeds up chemical reactions in the body.
- Epidemic: A sudden outbreak of disease affecting many people in a specific area.
- Epidermis: The outermost layer of the skin.
- Epiglottis: A flap of tissue that covers the windpipe during swallowing to prevent choking.
- Epilepsy: A neurological disorder marked by recurring seizures.
- Epinephrine: Also known as adrenaline; a hormone and medication used in allergic emergencies.
- Episiotomy: A surgical cut made at the opening of the vagina during childbirth to aid delivery.
- Epistaxis: The medical term for a nosebleed.
- ER (Emergency Room): A hospital unit for treating urgent and life-threatening conditions.
- Ergonomics: The science of designing tools and environments to fit the human body safely and efficiently.
- Erythema: Redness of the skin caused by increased blood flow, often due to irritation or infection.
- Esophagus: The muscular tube that carries food from the mouth to the stomach.
- Estrogen: A primary female sex hormone important in reproductive and sexual health.
- Ethics (Medical): Moral principles guiding medical practice and decision-making.
- Euthanasia: The act of deliberately ending a person's life to relieve suffering.
- Eczema: A skin condition causing inflammation, itching, and redness.
- Excretion: The process of eliminating waste products from the body.
- Exophthalmos: Bulging of the eye anteriorly out of the orbit, commonly associated with thyroid disorders.
- Expiration: The act of breathing out air from the lungs.
- Extracellular Fluid: The fluid outside cells, including plasma and interstitial fluid.
F
- Fainting: A sudden, brief loss of consciousness due to decreased blood flow to the brain.
- Fasting: Voluntarily not eating food for a specific period, often for medical or religious reasons.
- Fatigue: A feeling of extreme tiredness or exhaustion that may be physical or mental.
- Feces: Waste matter discharged from the bowels; also known as stool or excrement.
- Fertility: The natural ability to conceive children.
- Fetus: A developing baby inside the womb after the embryonic stage, typically from 9 weeks until birth.
- Fever: A temporary increase in body temperature, often due to infection or illness.
- Fibroid: A noncancerous tumor made of muscle and fibrous tissue, usually in the uterus.
- Fibromyalgia: A condition characterized by widespread musculoskeletal pain, fatigue, and tenderness.
- Fibrillation: A rapid and irregular heartbeat that may be life-threatening.
- Fibrosis: Thickening or scarring of connective tissue, often due to injury or chronic inflammation.
- First Aid: Emergency medical care provided before professional help arrives.
- Flatulence: The presence of excess gas in the digestive tract, often resulting in passing gas.
- Flu (Influenza): A contagious viral infection that affects the respiratory system.
- Fluid Retention: When the body holds excess fluid, causing swelling, especially in the legs and feet.
- Folic Acid: A B-vitamin essential for cell growth and development, especially during pregnancy.
- Fracture: A break or crack in a bone.
- Free Radicals: Unstable molecules that can damage cells and contribute to aging and diseases.
- Friction Burn: A skin injury caused by rubbing against a rough surface.
- Frostbite: Damage to skin and tissues caused by freezing temperatures.
- Frozen Shoulder: A condition causing stiffness and pain in the shoulder joint.
- Fungal Infection: An infection caused by fungi, such as athlete’s foot or ringworm.
- Fungus: A type of organism that includes yeasts and molds, some of which can cause infections.
- Furosemide: A medication used to reduce fluid buildup caused by heart failure, liver, or kidney disease.
- Fusion (Spinal): A surgical procedure to join two or more bones in the spine to reduce pain or instability.
G
- Gallbladder: A small organ that stores bile, which helps digest fats.
- Gallstones: Hardened deposits that form in the gallbladder and can block bile flow.
- Gangrene: The death of body tissue due to a lack of blood flow or infection.
- Gastric Bypass: A type of weight-loss surgery that changes how your stomach and small intestine handle food.
- Gastritis: Inflammation of the stomach lining, often caused by infection or medication.
- Gastroenteritis: Inflammation of the stomach and intestines, commonly causing diarrhea and vomiting.
- Gastroesophageal Reflux Disease (GERD): A condition where stomach acid frequently flows back into the esophagus.
- Gastrointestinal (GI) Tract: The digestive tract, including the mouth, esophagus, stomach, intestines, and anus.
- Gene: A segment of DNA that determines specific traits or functions in the body.
- Genetic Disorder: A disease caused by abnormalities in an individual’s DNA.
- Genital Herpes: A sexually transmitted infection caused by the herpes simplex virus.
- Genital Warts: Growths or lumps in the genital area caused by certain types of HPV (Human Papillomavirus).
- Geriatrics: The branch of medicine focused on the health care of elderly people.
- Gestational Diabetes: A type of diabetes that develops during pregnancy and usually disappears after delivery.
- GI Bleeding: Bleeding that occurs anywhere along the gastrointestinal tract.
- Gingivitis: A mild form of gum disease causing redness, swelling, and bleeding gums.
- Glaucoma: A group of eye diseases that damage the optic nerve and can lead to vision loss or blindness.
- Glioblastoma: A fast-growing, aggressive type of brain tumor.
- Glucose: A type of sugar that is the body’s main source of energy.
- Gluten: A protein found in wheat, barley, and rye that can cause health issues in some people.
- Goiter: An abnormal enlargement of the thyroid gland, often visible as a neck swelling.
- Gout: A form of arthritis caused by the buildup of uric acid crystals in the joints.
- Granuloma: A small area of inflammation in tissue, often due to infection or immune response.
- Growth Hormone: A hormone that stimulates growth, cell reproduction, and regeneration.
- Guillain-Barré Syndrome: A rare neurological disorder where the immune system attacks the nerves.
- Gynecology: The branch of medicine that deals with the health of the female reproductive system.
H
- Hallucination: A false perception of something that is not present, such as hearing voices or seeing things.
- Hay Fever: An allergic reaction to pollen, causing sneezing, runny nose, and itchy eyes.
- Headache: Pain in the head or upper neck, with many possible causes including stress or illness.
- Heart Attack: A medical emergency caused by blocked blood flow to the heart muscle.
- Heart Failure: A chronic condition where the heart cannot pump blood effectively.
- Heart Murmur: An abnormal sound heard during a heartbeat, sometimes harmless or indicating a heart condition.
- Heart Rate: The number of times the heart beats per minute (bpm).
- Heartburn: A burning sensation in the chest caused by stomach acid rising into the esophagus.
- Heat Exhaustion: A heat-related illness with symptoms like heavy sweating, dizziness, and weakness.
- Heat Stroke: A life-threatening condition caused by prolonged exposure to high heat, leading to body temperature above 104°F (40°C).
- Hearing Loss: Partial or total inability to hear sounds in one or both ears.
- Hematology: The study of blood, blood-forming organs, and blood diseases.
- Hematoma: A collection of blood outside of blood vessels, usually due to injury or trauma.
- Hematuria: Presence of blood in urine, possibly indicating infection or kidney problems.
- Hemoglobin: The protein in red blood cells that carries oxygen throughout the body.
- Hemophilia: A genetic disorder in which blood doesn’t clot normally due to lack of clotting factors.
- Hemorrhage: Excessive or uncontrollable bleeding, either internal or external.
- Hemorrhoids: Swollen veins in the lower rectum or anus that may cause discomfort, pain, or bleeding.
- Hepatitis: Inflammation of the liver, often caused by viral infections like Hepatitis A, B, or C.
- Hernia: A condition where an internal part of the body pushes through a weakness in the muscle or tissue wall.
- Hiccups: Involuntary spasms of the diaphragm followed by a quick closure of the vocal cords.
- High Blood Pressure (Hypertension): A condition in which the force of blood against artery walls is consistently too high.
- Hirsutism: Excessive hair growth in women in areas where hair is normally minimal or absent.
- HIV (Human Immunodeficiency Virus): A virus that attacks the immune system and can lead to AIDS if untreated.
- Hives (Urticaria): A skin reaction that causes itchy welts, usually due to an allergic response.
- Hodgkin’s Lymphoma: A type of cancer that affects the lymphatic system.
- Hormones: Chemical messengers that regulate various functions in the body such as growth, mood, and metabolism.
- Hospice Care: Care focused on comfort and quality of life for people with terminal illnesses.
- Hospital-Acquired Infection (HAI): An infection a patient gets while receiving treatment in a healthcare facility.
- Hot Flashes: A sudden feeling of warmth, often experienced during menopause.
- Hydration: The process of maintaining the right balance of fluids in the body.
- Hydrocephalus: A condition where excess cerebrospinal fluid builds up in the brain, causing pressure.
- Hydronephrosis: Swelling of a kidney due to a build-up of urine, often from an obstruction or blockage.
- Hyperglycemia: High blood sugar levels, commonly associated with diabetes.
- Hyperlipidemia: Elevated levels of fats (lipids) in the blood, such as cholesterol or triglycerides.
- Hyperthyroidism: Overactivity of the thyroid gland, producing excess thyroid hormones.
- Hypoglycemia: Low blood sugar levels, which can cause dizziness, sweating, and confusion.
- Hypotension: Abnormally low blood pressure.
- Hypothyroidism: Underactive thyroid gland leading to slowed metabolism and fatigue.
- Hysterectomy: Surgical removal of the uterus.
I
- IBS (Irritable Bowel Syndrome): A digestive disorder causing abdominal pain, bloating, and changes in bowel habits.
- ICU (Intensive Care Unit): A hospital unit for critically ill patients needing constant monitoring and care.
- Ileostomy: A surgical opening created in the abdominal wall to allow waste to bypass the colon.
- Immune System: The body’s defense system against infections and diseases.
- Immunity: The body’s ability to resist harmful microorganisms or toxins.
- Immunization: The process of making a person immune to a disease, often through vaccination.
- Immunocompromised: A weakened immune system that reduces the ability to fight infections.
- Immunodeficiency: A condition where the immune system’s ability to fight infections is impaired or absent.
- Immunoglobulin: Also known as antibodies, these are proteins produced by the immune system to fight antigens.
- Implant: A medical device inserted into the body to replace or support a function (e.g., dental or contraceptive implant).
- Impotence: The inability to achieve or maintain an erection sufficient for sexual activity.
- Incision: A surgical cut made in the skin or body tissue.
- Incontinence: Loss of control over urination or bowel movements.
- Incubation Period: The time between exposure to an infection and the appearance of symptoms.
- Indigestion: Discomfort or pain in the upper abdomen, often related to eating.
- Infection: The invasion and multiplication of harmful microorganisms in the body.
- Inflammation: The body’s response to injury or infection, often causing redness, swelling, and pain.
- Influenza (Flu): A contagious viral respiratory illness with symptoms like fever, cough, and fatigue.
- Infusion: The slow introduction of a fluid (e.g., medication or nutrients) into a vein.
- Inhaler: A device used to deliver medication directly into the lungs, often for asthma or COPD.
- Injury: Physical harm or damage to the body due to accident, trauma, or impact.
- Inoculation: The act of introducing a vaccine or antigen into the body to produce immunity.
- Insomnia: Difficulty falling asleep or staying asleep.
- Insulin: A hormone that regulates blood sugar levels; often administered in diabetes treatment.
- Intensive Care: Specialized care for patients with life-threatening conditions requiring close monitoring.
- Intermittent Fasting: A pattern of eating that alternates between periods of fasting and eating.
- Intervention: An action or treatment intended to improve a health condition or stop its progression.
- Intestines: Part of the digestive system responsible for absorbing nutrients and removing waste.
- Intubation: Inserting a tube into the airway to assist with breathing.
- Intrauterine Device (IUD): A small device inserted into the uterus to prevent pregnancy.
- Invasive Procedure: A medical procedure that involves entering the body, often by cutting or inserting instruments.
- Iron Deficiency: A lack of iron in the body, often leading to anemia and fatigue.
- Ischemia: Reduced blood flow to a part of the body, often leading to tissue damage.
- Isolation: Separating individuals to prevent the spread of infectious diseases.
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