In-depth

Symptoms

Abdominal pain

Find out what causes different types of abdominal pain.

Headache

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

Nausea and vomiting

Sick to your stomach? Nausea and vomiting usually pass quickly but sometimes result from long-term or serious conditions.

Treatments and drugs

Blood transfusion

Blood transfusions boost blood levels that are low due to surgery, injury or disease. Learn about the benefits, risks and what to expect.

Sep. 30, 2011