Chest Pain
Cardiac, pulmonary, musculoskeletal, digestive, and anxiety causes explained with clear emergency guidance.
Potentially urgent — may require 911
12 min read
Symptom Guides A–Z
Understanding what a symptom means — its possible causes, urgency, and when to act — is one of the most valuable things you can do for your health. Our guides help you navigate that decision confidently.
These guides are informational — not a substitute for medical assessment
If you are worried about a symptom, consult a qualified healthcare provider. If you believe you are having a medical emergency, call 911 immediately.
Available now
Symptom guides
Fatigue & Chronic Tiredness
14 medical causes with diagnostic tests, ME/CFS, Long COVID fatigue, and evidence-based management.
See doctor if lasting >2 weeks
13 min read
Headache
Tension, migraine (with 4-phase guide and CGRP drugs), cluster headache, and dangerous secondary headaches.
"Thunderclap" headache: call 911
14 min read
Fever
Temperature guide in °F and °C, causes table, age-by-age guide for children, vulnerable adults, and home care.
Above 104°F (40°C): seek care
11 min read
Shortness of Breath
Cardiac, pulmonary, and other causes, oxygen saturation explained, and MRC dyspnoea scale.
Sudden severe: call 911
10 min read
Coming soon