Main Page
WikiMD Medical Encyclopedia
A free worldwide medical and wellness encyclopedia created through collaborative knowledge.
Latest news
Drug and safety updates
Review recalls, approvals, shortages and medication safety communications from the FDA Newsroom.
Public health alerts
Follow current outbreaks, emergency notices and prevention guidance from the CDC Media Center.
Medical research highlights
Read recent discoveries and research announcements from the National Institutes of Health.
Explore the medical encyclopedia
Diseases and conditions
Browse diabetes, hypertension, heart disease, cancer, infectious diseases and chronic conditions.
Drugs and pharmacology
Explore medications, drug classes, uses, mechanisms, contraindications, interactions and safety topics.
Anatomy and physiology
Study body systems, organs, physiology, pathology, Gray's Anatomy and illustrated medical references.
Tests and procedures
Understand laboratory tests, medical imaging, diagnostic procedures, screening and treatment procedures.
Food and nutrition
Learn about nutrients, healthy eating, dietary patterns, food science, vitamins, minerals and medically relevant diets.
Rare diseases
Find information about genetic disorders, congenital conditions, complex syndromes and orphan diseases.
Preventive health
Explore vaccination, screening, physical activity, sleep, risk reduction and evidence-based preventive care.
Patient education
Start with symptoms, medication safety, chronic disease, questions for clinicians and When to call a doctor.
Featured medical topics

Gray's Anatomy
Explore classic illustrated human anatomy with WikiMD links connecting structures to physiology, disease and clinical terminology.
Cardiovascular disease
Learn about coronary artery disease, stroke, hypertension, risk factors, symptoms, testing, prevention and treatment.
Artificial intelligence in healthcare
Explore machine learning, clinical decision support, medical imaging, drug discovery, large language models and health-information quality.
- ...that the adult human heart typically beats about 100,000 times in one day?
- ...that skin is the body's largest organ and helps regulate temperature, sensation and protection?
- ...that antibiotic resistance occurs when microorganisms change in ways that reduce the effectiveness of medicines—not when a person's body becomes resistant?
- ...that sleep supports memory, immune function, metabolic health and emotional regulation?
- ...that vaccination protects both vaccinated individuals and communities by reducing the spread and severity of infectious disease?
- ...that Gray's Anatomy was first published in 1858 and remains one of the best-known works in anatomical education?
Find information by what you need
I have a symptom
Explore the symptom index, common causes, related conditions and guidance on when to seek medical care.
I am researching a medication
Start with the Drug encyclopedia, medication safety, drug interactions, contraindications and drug classes.
I am studying medicine
Browse anatomy, physiology, pathology, pharmacology, microbiology, immunology and medical terminology.
I want to improve my health
Explore preventive health, nutrition, physical activity, sleep, weight management and lifestyle medicine.
Popular topic collections
Conditions
Clinical science
Nutrition and wellness
Reference collections
For patients and families
For students and health professionals
About WikiMD
WikiMD is an independent medical encyclopedia designed to make interconnected health information easier to find and understand. Content is intended for education and reference and does not replace individualized medical advice, diagnosis or treatment.
Editorial resources: Editorial policy • Medical disclaimer • Contact WikiMD • Site statistics
Advertise on WikiMD — 81,000+ full articles, ~900,000 total pages, ~250 million page views. Global reach, limited time promotional rates from $1/page/day. Learn more · View stats
Medical Disclaimer: WikiMD is for informational purposes only and is not a substitute for professional medical advice. Content may be inaccurate or outdated and should not be used for diagnosis or treatment. Always consult your healthcare provider for medical decisions. Verify information with trusted sources such as CDC.gov and NIH.gov. By using this site, you agree that WikiMD is not liable for any outcomes related to its content. See full disclaimer.
Credits:Most images are courtesy of Wikimedia commons, and templates, categories Wikipedia, licensed under CC BY SA or similar.
Translate page: - East Asian
中文,
日本,
한국어,
South Asian
हिन्दी,
தமிழ்,
తెలుగు,
Urdu,
ಕನ್ನಡ,
Southeast Asian
Indonesian,
Vietnamese,
Thai,
မြန်မာဘာသာ,
বাংলা
European
español,
Deutsch,
français,
Greek,
português do Brasil,
polski,
română,
русский,
Nederlands,
norsk,
svenska,
suomi,
Italian
Middle Eastern & African
عربى,
Turkish,
Persian,
Hebrew,
Afrikaans,
isiZulu,
Kiswahili,
Other
Bulgarian,
Hungarian,
Czech,
Swedish,
മലയാളം,
मराठी,
ਪੰਜਾਬੀ,
ગુજરાતી,
Portuguese,
Ukrainian
