STDs are among the most common infectious diseases in this country—the United States has the highest rates of STDs in the industrialized world.

The only safe sex is no sex, most health care providers say. But certain precautions and safe behaviors can minimize a person's risk of contracting a sexually transmitted disease.

AIDS is caused by the human immunodeficiency virus, which kills or impairs cells of the immune system and progressively destroys the body's ability to fight infections and certain cancers.

If you notice your skin is tinged with yellow and the whites of your eyes have taken on a yellow hue, you might have jaundice. It's not a disease, but a condition of the body or a symptom that signals something is wrong.

Hepatitis is an inflammation of the liver most commonly caused by one of several viruses. More than 150,000 hepatitis infections occur annually in the United States, but the different viruses produce different outcomes for these infections.

Detailed information on hepatitis C, including causes, symptoms, risk factors, prevention, diagnosis, and treatment