About Symptom Checker
Free symptom checker based on CDC/NHS decision trees. Find out instantly whether your symptoms need ER, urgent care, or home rest.
AI-Synthesized
Outputs generated via specialized high-density logic nodes.
Zero Data Echo
No session data is localized or cached in the central registry.
Instant Access
Registry uptime stabilized at 99.9% for real-time utility.
How to use the Symptom Checker
Our free symptom checker uses decision trees based on guidance from the CDC and NHS to help you work out the right level of care for your symptoms — without the anxiety spiral of a late-night Google search.
Step 1: Select your main symptom
Choose the symptom that is bothering you most. If you have multiple symptoms, start with the most severe one. The tool will then ask you follow-up questions to narrow down the most likely cause and urgency level.
Step 2: Answer the follow-up questions
The decision tree asks about duration, severity, associated symptoms, and any risk factors you may have (age, underlying conditions, medications). Be as accurate as possible — this is what determines the output.
Step 3: Read your recommendation
Based on your answers, you will receive one of four recommendations: Go to the ER now, Visit urgent care today, See your GP this week, or Rest at home and monitor. Each comes with a short explanation of why and what to watch out for.
Limitations of this tool
This tool is not a substitute for professional medical advice. It cannot diagnose conditions, order tests, or prescribe medication. If your symptoms are severe, worsening rapidly, or you feel unsafe, call emergency services (911 in the US, 999 in the UK) immediately.
When to go to the ER without checking
- Chest pain or pressure
- Difficulty breathing or shortness of breath
- Weakness or numbness on one side of the body
- Sudden severe headache unlike any you have had before
- Loss of consciousness or seizure
- Uncontrolled bleeding
- Suspected poisoning or overdose