In-depth

Symptoms

Headache

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.

Treatments and drugs

Contact lens basics

LASIK eye surgery

LASIK eye surgery — Overview covers definition, risks, what to expect from vision correction surgery.

Oct. 17, 2014