Educational only, not medical advice. Microscopic Doctor is a health-education site, not a doctor, and reading it does not create a doctor-patient relationship. It does not diagnose or treat anything. For questions about your own health, talk to a licensed health professional. In an emergency, call 911 (or your local emergency number). Full disclaimer

The Microscopic Doctor, a cartoon doctor in a white coat and red cape, surrounded by giant cells

Everyday health, explained simply

Tiny Cells, Big Health Basics

Friendly, plain-English guides to sleep, germs, food, movement and safety, checked against the CDC, NIH, NHS and WHO. For learning, not for diagnosis.

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Guides, tools and more

Free, original and fact-checked, with sources on every page.

Know before you need itWhen to Get Help: 911, ER, Urgent Care or Your DoctorEmergency warning signs that mean call 911, stroke signs with BE FAST, when urgent care or your doctor fits, plus the 988 and Poison Help lines.Test your basicsEveryday Health QuizTen quick questions on sleep, hand washing, sun safety, food temperatures, activity and more, with answers checked against CDC, NHS and WHO.Words decodedHealth Glossary in Plain EnglishPlain-English meanings of common health words, from antibody and antigen to Danger Zone, SPF, chronic stress and TIA, with linked sources.

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12 deep dives

Microscopic Doctor zooms in on everyday health: how sleep, water, hand washing, food and movement help the cells that keep you going. Every page is general education drawn from public health bodies such as the CDC, NIH, NHS and WHO. It is not medical advice, so for anything personal, talk to a licensed healthcare professional.