From enjoying the great outdoors to playing sports safely, here's how to protect yourself and deal with emergencies.

What Do Substance Abuse and Addiction Mean? The difference between substance abuse and addiction is very slight. Substance abuse means using an illegal substance or misusing a legal substance.

What Does the Heart Do? The heart is a pump, usually beating about 60 to 100 times per minute. With each heartbeat, the heart sends blood throughout our bodies, carrying oxygen to every cell. After ...

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 ...

How much do you know about the urinary system, which makes pee? Find out by taking this quiz!

What Are the Key Characteristics of Bullying? Bullying is when someone is picked on by a person or group. Bullies might make fun of people who they think don't fit in. Bullies might make fun of others ...

Symptoms, inhaler, tonsillectomy — what do all those medical words mean? Check out our easy-to-read definitions.

Inhalants are things that are breathed in (inhaled) to give the user an immediate rush, or high. They include glues, paint thinners, dry cleaning fluids, gasoline, felt-tip marker fluid, hair spray, ...

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 ...

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 ...

Cystic fibrosis (SIS-tik fye-BROH-sis) is an inherited condition that causes the body to make thick, sticky mucus. The mucus causes problems in the lungs, pancreas, and other organs. People with ...

What Are the Lungs and Respiratory System? The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out ...