What Is Neurofibromatosis Type 1? Neurofibromatosis type 1 (NF1) is a genetic condition. It causes benign (not cancerous) tumors to grow in and under the skin, often with bone, hormone, and other ...

What's the Urinary System (Urinary Tract)? The urinary system (also called the urinary tract) is one of the systems our bodies use to get rid of waste products. The kidneys are the part of the urinary ...

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 ...

If you ever ate so much at Thanksgiving that you felt uncomfortable, you know what it feels like to overeat. It's not unusual to overeat from time to time. Most people do. But binge eating is ...

How Does the Digestive System Work? So there you are, sitting at lunch, enjoying some grilled-chicken pizza and a few orange wedges. When you're finished, you take a last drink of milk, wipe your ...

Taking prescription drugs in a way that hasn't been recommended by a doctor can be more dangerous than people think. In fact, it's drug abuse. And it's illegal, just like taking street drugs. Some ...

Most of us know that some teens cut. But cutting — using a sharp object like a razorblade, knife, or scissors to make marks, cuts, or scratches on one's own body — is just one form of self-injury.

What should you expect as your child grows? Learn how to understand and deal with your child's changing body and mind from infancy through the teen years.

How Does the Brain Work? And How Does the Nervous System Work? How do you remember the way to your friend's house? Why do your eyes blink without you ever thinking about it? Where do dreams come from?

Every single person has a skeleton made up of many bones. These bones give your body structure, let you move in many ways, protect your internal organs, and more. It's time to look at all your bones — ...

Soccer is an exciting, fast-paced game that's lots of fun to play. It's easy to learn and a great source of exercise. But soccer is a contact sport, and injuries can happen. To keep things as safe as ...

Teens are busy, and often skip meals. Even if you eat three meals a day, you may still feel hungry between meals. Either way, it can be tempting to grab something fast, like cookies, chips, and candy.