Symptoms after being in high temperatures (such as heat waves). Symptoms after hard work or sports during hot weather.

A hernia is a bulge in the groin or upper scrotum. The bulge contains a loop of intestine. It slides through a defect in the muscles of the lower abdomen.

A viral infection that causes little ulcers in the back of the mouth

A viral infection of the mouth and lips in young children

Hiccups are repeated gulping sounds caused by sudden spasms of the diaphragm. Burping is the sound made by the sudden release of stomach air through the mouth.

Hitting is the most common type of aggressive behavior. Others include slapping, pinching, scratching, poking, hair-pulling, biting, kicking, shoving, and knocking down.

Hives is a rash made up of raised pink bumps with pale centers. Most often, rash is very itchy

A hoarse voice (or cry) is raspy and deeper than normal. If hoarseness is severe, the child can do little more than whisper.