Allergic reactions can be triggered by foods, medicines, pets, insect stings, pollen, and other things. Most allergic reactions aren't serious. But severe reactions can be life-threatening and need ...

What Is a Liver Transplant? A liver transplant is a surgery in which doctors remove a person's sick liver and replace it with a healthy donor liver. Transplants are done when a child's liver does not ...

Testicular torsion is an emergency condition. It happens when the spermatic cord, which provides blood flow to the testicle, rotates and becomes twisted. The twisting cuts off the testicle's blood ...

Our bodies create a lot of heat. Normally, they're cooled through sweating and by heat radiating through the skin. But in very hot weather, high humidity, and other conditions, this natural cooling ...

Are you thinking about volunteering? Planning for life after high school? This section offers help with homework, dealing with bullying, finding a summer job, and lots more.

Glucose is the main type of sugar in the blood and is the major source of energy for the body's cells. Glucose comes from the foods we eat or the body can make it from other substances. Glucose is ...

Vomiting can be caused by many things, most commonly gastroenteritis (the "stomach flu"). Vomiting (throwing up) can cause kids to lose fluids, salts, and minerals, so it's important to make sure ...

Staying safe means you can have more fun! Learn how to play it safe at home, outdoors, and on the road.

People who have lactose intolerance (say: LAK-tose in-TAHL-er-ents) have trouble digesting (say: dye-JES-ting) lactose, a type of sugar found in milk and other dairy foods. Lactose intolerance does ...

Compulsive exercise (sometimes called exercise addiction) happens when a person is driven to exercise too much. Injury, illness, going out with friends, or bad weather will not stop those who ...

Staying Safe in the Water Watching out for kids when they're around water — from play pools to the ocean — is a big responsibility. Here's how to keep them safe. Pool safety Prevent drowning Rivers, ...

What Is the Endocrine System? The endocrine system is made up of glands that make hormones. Hormones are the body's chemical messengers. They carry information and instructions from one set of cells ...