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Look up any symptom, condition, or treatment — plain-English answers on causes, self-care, and when to see a doctor. Sourced from FDA, CDC, and peer-reviewed research.
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Chronic Fatigue
Persistent tiredness that doesn't improve with rest and affects daily activities.
Persistent exhaustion lasting...Fatigue that worsens...Unrefreshing sleep—waking up...
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Insomnia
Difficulty falling or staying asleep, causing daytime fatigue.
Difficulty falling asleep...Waking during the...Waking too early...
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Anxiety Disorders
Feelings of worry, nervousness, or unease about something with an uncertain outcome.
Excessive, difficult-to-control worrying...Feeling restless, wound-up,...Being easily fatigued...
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Migraine
A neurological condition causing intense, throbbing headaches often with nausea and light sensitivity.
Intense throbbing or...Nausea and/or vomiting...Extreme sensitivity to...
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Back Pain (Lower Back Pain)
Pain in the lower back region, ranging from a dull ache to sharp, shooting pain. One of the most common reasons for missed work and doctor visits.
Dull, aching pain...Sharp or stabbing...Pain worsening with...
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Acid Reflux (GERD)
A digestive condition where stomach acid frequently flows back into the esophagus, causing heartburn, regurgitation, and other symptoms. Chronic acid reflux is called GERD (Gastroesophageal Reflux Disease).
Heartburn (burning in...Acid regurgitation into...Difficulty swallowing...
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Irritable Bowel Syndrome (IBS)
A common disorder affecting the large intestine, causing cramping, abdominal pain, bloating, gas, and diarrhea or constipation.
Abdominal pain, cramping,...Changes in appearance...Changes in frequency...
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Seasonal Allergies (Hay Fever)
Allergic reaction to airborne substances like pollen, causing sneezing, itchy eyes, and runny nose.
Sneezing...Runny or stuffy...Itchy, watery eyes...
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High Blood Pressure (Hypertension)
A common condition where blood pressure against artery walls is consistently too high.
Often has no...Headaches (in severe...Shortness of breath...
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Notes from the Field: Clinical Characteristics of Patients with Ebola Disease Caused by Bundibugyo Virus — Uganda, 2026
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Subpotent Drug...
Levothyroxine Sodium Tablets, USP, 200 mcg (0.2 mg), packaged in a) 90-count bottles (NDC 16729-457-15) and b) 1000-count bottles (NDC 16729-457-17), Rx Only, Manufactured for: Accord Healthcare, Inc. Classification: Class II
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Ear, Nose & Throat
sinus, sore throat, ear pain
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Chest & Heart
chest pain, palpitations, breathing
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cough, asthma, pneumonia
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nausea, IBS, acid reflux
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back pain, sciatica, disc
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knee pain, ACL, meniscus
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rotator cuff, frozen shoulder
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plantar fasciitis, sprain
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Quick Answers
Common Health Questions
Quick answers to questions people ask most often.
When should I see a doctor instead of trying self-care?+
See a doctor immediately for chest pain, sudden severe headache, difficulty breathing, severe abdominal pain, signs of stroke (face drooping, arm weakness, speech difficulty), high fever (above 103°F / 39.4°C in adults), or symptoms that suddenly worsen. For most other concerns, see a doctor if symptoms last more than 7-10 days, get worse instead of better, or interfere with daily activities.
How can I tell if my symptoms are serious?+
Warning signs include: pain that is severe or sudden, symptoms that worsen rapidly, fever lasting more than 3 days, unintentional weight loss, blood in urine or stool, severe headache different from any you have had before, chest pain or pressure, shortness of breath, or any sudden weakness or numbness. When in doubt, contact a healthcare provider.
Are the articles on QuickSymptom medically accurate?+
Our content is based on guidance from authoritative sources including the FDA, CDC, NIH, Mayo Clinic, and peer-reviewed medical journals. However, this information is educational only and does not replace professional medical advice. Always consult a qualified healthcare provider for diagnosis and treatment.
How often is the information updated?+
We review our condition pages regularly to reflect current medical guidelines. Each article displays a last-reviewed date. Drug information and recall notices are updated more frequently to reflect FDA actions.
Is QuickSymptom free to use?+
Yes — QuickSymptom is completely free. No account required, no paywalls, no subscriptions. We do not sell your data.
Can I trust online health information?+
Trustworthy health information comes from authoritative sources (government health agencies, academic medical centers, peer-reviewed journals), is written or reviewed by qualified medical professionals, is updated regularly, and clearly cites its sources. Always cross-reference important information with your healthcare provider.
What is the difference between a symptom and a condition?+
A symptom is what you feel or notice (such as headache, fatigue, or stomach pain). A condition is the underlying diagnosis that may cause symptoms (such as migraine, anemia, or ulcer). One condition can cause many symptoms, and the same symptom can come from many different conditions.
When is a fever considered dangerous?+
In adults, fever above 103°F (39.4°C) warrants prompt medical attention. In children, fever above 100.4°F (38°C) in babies under 3 months, above 101°F in babies 3-6 months, or above 103°F at any age needs medical evaluation. Seek emergency care if fever is accompanied by stiff neck, severe headache, confusion, difficulty breathing, or rash that does not fade when pressed.
How long should a cold or flu last before I should worry?+
A typical cold lasts 7-10 days. Flu symptoms peak at 2-4 days and improve over 7-10 days, though cough and fatigue can linger 2-3 weeks. See a doctor if symptoms last beyond 10 days without improvement, if symptoms improve then suddenly worsen (could indicate bacterial infection), if you have high fever for more than 3 days, or if you experience difficulty breathing.
What is the difference between Tylenol and Advil?+
Tylenol (acetaminophen) reduces pain and fever but does not reduce inflammation. It is gentler on the stomach but can damage the liver if overused. Advil (ibuprofen) is an NSAID that reduces pain, fever, AND inflammation, making it better for muscle pain, arthritis, or injuries — but can irritate the stomach and is harder on the kidneys. Acetaminophen is generally preferred during pregnancy and for those with stomach issues; ibuprofen is preferred for inflammation-driven pain.
About QuickSymptom
QuickSymptom is a free health information library covering 500+ conditions, symptoms, and treatments. Our goal: give you clear, plain-English answers so you can decide what to do next — whether that is self-care, an appointment, or urgent care.
We do not replace your doctor. We help you walk into the appointment better informed and ask the right questions.
Our Sources
- ✓FDA — drug approvals, recalls, safety communications
- ✓CDC — disease guidelines, outbreak data, prevention
- ✓NIH — clinical research, treatment guidelines
- ✓Mayo Clinic & Cleveland Clinic — clinical references
- ✓Peer-reviewed journals — JAMA, NEJM, BMJ, Lancet
Medical disclaimer: Information on this site is educational only. Always consult a qualified healthcare provider for diagnosis and treatment of any medical condition.