How much do you know about your bones? Find out by taking this quiz!

What Is an Umbilical Hernia? An umbilical hernia happens when part of a child's intestines bulges through the abdominal wall inside the belly button. It shows up as a bump under the belly button. The ...

We see and hear about hearts everywhere. A long time ago, people even thought that their emotions came from their hearts, maybe because the heart beats faster when a person is scared or excited. Now ...

How Does Air Enter the Respiratory System? Air enters the respiratory system through the nose or the mouth. If it goes in the nostrils (also called nares), the air is warmed and humidified. Tiny hairs ...

Girls have lots of questions about the body changes of puberty. When will my breasts grow? What's the "normal" age to get your first period? Watch this video and find out!

It’s normal for people to masturbate (touch or rub their own genitals because they like the way it feels). Some people do it to relieve stress or tension. It’s nothing to be ashamed of or embarrassed ...

Both the brain and the spinal cord are protected by bone: the brain by the bones of the skull, and the spinal cord by vertebrae, a set of ring-shaped bones. They're both cushioned by layers of ...

Did you know you have more than 600 muscles in your body? They do everything from pumping blood throughout your body to helping you lift your heavy backpack. You control some of your muscles, while ...

What Is a Tear-Duct Blockage? A tear duct is a small tube that drains tears from the eyes. Tears are made in glands under the eyelids. They wash over the eyes to keep them moist and clean. Then, they ...

What Is Breast Reduction Surgery? Breast reduction surgery is a procedure that makes large breasts smaller. It keeps the natural shape of the breast and nipple/areola (small area around the nipple).

Alopecia areata (al-uh-PEE-shuh air-ee-AH-tuh) is a condition that causes hair loss on the scalp and sometimes elsewhere on the body, such as the eyebrows and eyelashes. The condition is not ...

Pinworms are tiny worms that can cause an infection in the intestines. Pinworm infections affects millions of people each year, especially school-age kids If your child develops a pinworm infection, ...