Low blood pressure (hypotension) can be a sign of good health or of a life-threatening condition. Find out more about hypotension's causes and treatment options.
Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.
Hives and angioedema — Comprehensive overview covers symptoms, causes, treatment of these common allergic disorders.
Sick to your stomach? Nausea and vomiting usually pass quickly but sometimes result from long-term or serious conditions.
Runny nose: What's causing your sniffles?
Shortness of breath can be frightening. Most of the time, a heart or lung condition is the cause.
Tachycardia, a rapid heart rate, is caused by an abnormality in your heart's electrical impulses. Tachycardia can cause serious complications, including sudden cardiac arrest.
Wheezing is commonly associated with asthma, but there are many possible causes of this symptom.
Tests and diagnosis
Itching, sneezing and swelling: Find out what's causing your allergy symptoms.
Jun. 27, 2012
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