In-depth

How to administer first aid for insect bites or stings.

Allergy skin tests

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

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.

Headache

Most headaches aren't caused by a serious illness, but some could be a sign of a life-threatening condition.

Hives and angioedema

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

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.

Feb. 07, 2014

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