In-depth

Causes

Heart arrhythmias

Complications

Dehydration

You normally lose about 10 cups (2.4 liters) of water every day — much more during exercise or illness. Learn how to stay hydrated.

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.

Prevention

Hand-washing tips

Symptoms

Coma

Dry skin

Extreme temperatures — hot or cold — can take a toll on your skin. Here's how to pamper and protect it.

Fatigue

Fatigue can signal many things. Here are some tips to help you decipher why you're wiped out and to regain your energy.

Nausea and vomiting

April 05, 2014