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 ...

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, ...

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

What Is Hand, Foot, and Mouth Disease (HFM)? Hand, foot, and mouth disease (HFM) is a common viral infection that causes painful red blisters in the mouth and throat, and on the hands, feet, and ...

I have lots of little bumps (almost like goosebumps or whiteheads) on my penis. Is this a sign that something is wrong? If you've never had sex, little white bumps on the shaft of the penis may be ...

Sugar substitutes are artificial (fake) sweeteners. Some food makers use sugar substitutes in place of sugar to make foods and drinks taste sweet. These sweeteners don’t have nutrients to help kids ...

Sexually transmitted diseases (STDs) are infections spread from person to person during sex (vaginal, oral, or anal) or close sexual contact. STDs are also called sexually transmitted infections, or ...

What Is Polycystic Ovary Syndrome (PCOS)? Polycystic (pronounced: pol-ee-SISS-tik) ovary syndrome (PCOS) is a common health problem that can affect teen girls and young women. It can cause irregular ...

All kids get a fever from time to time. Usually, a fever isn’t dangerous or bad for kids. It can even be a good thing because it can help the immune system fight infection. Still, parents might be ...