In-depth

Allergy skin tests

Itching, sneezing and swelling: Find out what's causing your allergy symptoms.

Anaphylaxis

Anaphylaxis is the most serious type of allergic reaction. It often occurs rapidly after exposure to an allergen and may be life-threatening.

Dermatitis

Dermatitis, an inflammation of the skin, can have many causes and occur in many forms. Here's how to recognize and treat this itchy skin disorder.

Diarrhea

Here's information about common causes of diarrhea and when to see your doctor.

Dizziness

Dizziness has many possible causes. The cause of dizziness may be simple, or dizziness may be a sign of a more serious disorder.

Hives and angioedema

Hives and angioedema — Comprehensive overview covers symptoms, causes, treatment of these common allergic disorders.

Low blood pressure (hypotension)

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.

Runny nose

Runny nose: What's causing your sniffles?

Shortness of breath

Shortness of breath can be frightening. Most of the time, a heart or lung condition is the cause.

Tachycardia

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.

Jun. 27, 2012

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