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Herpes is a sexually transmitted disease (STD) or sexually transmitted infection (STI). It causes painful outbreaks of blisters and sores. It spreads through contact with an infected area—usually a sore on the genitals, rectum, or mouth.

HIV weakens the parts of the body that fight off disease (the immune system). It spreads through body fluids passed during sex or through infected needles. When HIV starts to cause severe health problems, it's called AIDS. There's no cure for HIV or AIDS. But treatment called antiretroviral therapy can help you stay healthier longer.

HPV (human papilloma virus) spreads through skin contact. Some types of HPV cause genital warts. Learn what to look for, how warts form, and how to treat and prevent HPV.

Hemorrhoid tissues are "cushions" of blood vessels that swell slightly during bowel movements. Too much pressure on the anal canal can make these tissues stay enlarged and cause symptoms. This can happen both inside and outside the anal canal.

Read on to learn about herpes sores and the tests you may need for diagnosis.

A hernia occurs when a section of bowel pushes out through a weakness in the muscle. The hernia looks like a bulge under the skin. In baby boys, a bulge in the scrotum is the most common type of hernia and is the result of a persistent canal between the scrotum and abdomen that normally closes when a fetus is developing. A hernia can move back into the abdomen through the passage. So you may not see the bulge all the time. You may see it most when your baby is straining (such as during crying, feeding, or a bowel movement).

Learn about hepatitis A virus in your child, including symptoms, diagnosis, treatment, and possible complications.

Learn how to take steps to protect your child and the rest of your family from the most common types of viral hepatitis.

Your child has been diagnosed with a hepatitis infection. Hepatitis causes inflammation of the liver. This document covers symptoms, diagnosis, and treatment of a hepatitis B infection.