Anorexia nervosa

C. difficile

C. difficile can be a life-threatening infection. It typically develops when antibiotics destroy other bacteria in your intestines, allowing C. difficile to flourish.

Food poisoning

Food poisoning has many forms, and some can be serious. Here's how to recognize food poisoning and ways to prevent getting sick.

Inflammatory bowel disease (IBD)


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.


Heat and exercise

Risk factors

Dehydration and youth sports


Dry skin

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


Don't be in a hurry to treat a low-grade fever — it's probably helping your body fight infection. High or lasting fevers may need medical attention.


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

Symptom Checker

Foot pain? Headache? Sore throat? Skin rash? Use the Symptom Checker to find out what's causing your symptom.


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.

Tests and diagnosis


Urinalysis can be used to assess your overall health, detect a wide range of disorders, or monitor a medical condition or treatment.

Feb. 12, 2014