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Symptom Checker
Not sure whether a symptom needs urgent care, a routine appointment, or just watching at home? Pick your symptom below. This checker first screens for the red-flag warning signs doctors watch for, then explains the possible causes in plain language, with condition guides and videos from the MedicalVideos.com library. It covers all 201 symptoms in our Symptoms A–Z index.
This is an educational tool, not a diagnosis — and nothing you type is stored or sent anywhere: the checker runs entirely in your browser.
Browse by area of the body
Common symptoms
How this checker works
1. You pick a symptom. Search, browse by body area, or choose from the common symptoms above.
2. You check the red flags. Every symptom in our index has a set of warning signs written for it. If any of them are happening now, the checker tells you to get care first and explains after — safety before reading.
3. You learn the possible causes. The results explain what the symptom can feel like, the conditions it can be associated with (common first), what a clinician may do, and link you to condition guides, procedure guides and videos. Possibilities to discuss with a clinician — never a diagnosis.
Frequently asked questions
Is this a diagnosis?
No. No website can diagnose you. This tool organises reliable information about a symptom — its warning signs and possible causes — so you can decide how quickly to seek care and have a better conversation with your clinician.
What are red flags?
Red flags are the specific warning signs that make a symptom more likely to need urgent assessment — for example, chest pain that spreads to the arm or jaw, or a fever with a stiff neck. Each symptom page and this checker list them clearly.
Is anything I type saved?
No. The checker loads a fixed symptom index and runs entirely in your browser. Your answers are never stored, sent, or shared.
Browse symptoms by area
Or browse the full Symptoms A–Z index — every symptom explained: what it can feel like, possible causes, red flags, and what a clinician may do.