Medical Dictionary

Health Glossary

Demystifying medical language. Browse or search for clear, human-centered explanations of common medical terms.

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A hair follicle is a tiny tunnel-like structure in the skin from which a hair grows. Each hair follicle is…

A serious condition that happens when blood flow to part of the heart becomes blocked. Symptoms may include: Related:

A general term for conditions affecting the heart. Examples include: Related:

A protein in red blood cells that carries oxygen around the body. Low hemoglobin levels can contribute to anemia and…

Inflammation of the liver. Hepatitis may be caused by: Symptoms may include: Related:

Protection that occurs when enough people in a population become immune to a disease, making spread less likely. Vaccination helps…

A virus that attacks the immune system and weakens the body’s ability to fight infections. Without treatment, HIV can progress…

Homeostasis is the body’s ability to maintain a stable internal environment despite changes inside or outside the body. Processes such…

A hormone is a chemical messenger that helps regulate the activity of cells, tissues, and organs. Hormones are produced mainly…

Practices that help maintain cleanliness and reduce disease spread. Examples include: Related:

A condition where blood pressure stays too high over time. Hypertension often causes no symptoms early on but can damage:…

The hypodermis, also called the subcutaneous tissue, is the deepest layer beneath the skin. It consists mainly of fat (adipose…

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