Before having sex, it’s important to know about birth control and protecting against unplanned pregnancy and sexually transmitted diseases (STDs).

Alpha thalassemia is a blood disorder in which the body has a problem producing alpha globin, a component of hemoglobin, the protein in red blood cells that transports oxygen throughout the body.

During the teen years, sexual feelings are awakened in new ways. It takes time for many teens to understand who they are, who they're becoming, and their sexual feelings and attractions.

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

Take this quiz about your brain and nervous system, the system that controls everything you do.

The digestive process starts even before the first bite of food. Find out more about the digestive system and how our bodies break down and absorb the food we eat.

A "popped" eardrum is more than just painful - it can sometimes lead to hearing loss. Learn about ruptured eardrums and how to prevent them.

Your brain is the boss of your body and runs the whole show. Learn more in this article for kids.

The glands of the endocrine system and the hormones they release affect almost every cell, organ, and function of our bodies.

You can help prevent frostbite in cold weather by dressing kids in layers, making sure they come indoors at regular intervals, and watching for frostnip, frostbite's early warning signal.

Find out what you can do if you think you or a friend has a drug or alcohol addiction - from recognizing the warning signs to suggestions to help you stay clean.

Cardiac catheterization helps doctors perform diagnostic tests on the heart and even treat some heart conditions.