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 ...

Gynecology ("gyn" for short) is a medical field that focuses on the female reproductive system. A gyn checkup is a yearly health check — like a regular eye exam or dental checkup. Doctors often call ...

What Is the Respiratory System? When we breathe, the respiratory system takes in oxygen and sends out carbon dioxide. The cells in our bodies need fresh oxygen to stay alive. As cells do their jobs, ...

Most of us know about teens and cutting — how some use a sharp object like a razorblade, knife, or scissors to make marks, cuts, or scratches on their own body. But cutting is just one form of ...

The eye infection conjunctivitis (kun-junk-tih-VY-tus) — often called pink eye — is common in young kids. It's usually contagious, and breakouts can sweep through preschools and playgrounds. But even ...

Trimming your little one's nails can be a bit scary, especially at first. But keeping nails short is important to your baby's safety. Because they lack muscle control, infants can easily scratch and ...

Which part of your body lets you read the back of a cereal box, check out a rainbow, and see a softball heading your way? Which part lets you cry when you're sad and makes tears to protect itself?

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 ...

Cancer is a scary word. Almost everyone knows someone who got very sick or died from cancer. Most of the time, cancer affects older people. Not many kids get cancer, but when they do, very often it ...

Why Is Water Safety Important? Water safety isn't just about keeping kids safe in the pool. Bathroom water safety is also important. Things you might not think about — like catchment ponds, drainage ...

What Is Patellofemoral Pain Syndrome? Patellofemoral pain syndrome (PFP syndrome) is pain in and around the kneecap (patella). PFP syndrome is also called "runner's knee." Rest and exercises that ...

A stiff neck without other symptoms is often caused by minor muscle strain from sleeping in an odd position or looking down at a phone too long. This usually gets better with home care. When Should I ...