La única manera de que los médicos sepan si una persona se ha estado masturbando es que la zona se haya irritado lo suficiente como para enrojecerse o adquirir una tonalidad más oscura de la habitual.

Where would you be without your bones? Learn more about the skeletal system in this article for kids.

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

What makes up a guy's reproductive system and how does it develop? Find the answers to these questions and more.

Puberty causes all kinds of changes in your body - and some may not make you feel very desirable. Read this article for information on dealing with greasy hair, perspiration, and body hair.

Take this quiz about the circulatory system, which sends blood throughout your body.

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

Kids and teens with cystic fibrosis can have trouble breathing and lung infections. Learn about the signs and treatment.

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

An underactive thyroid makes too little thyroid hormone, causing hypothyroidism. Hashimoto's thyroiditis, which causes most cases of hypothyroidism in kids and teens, is a condition in which the ...

These 5 tips can help you disagree with someone in a constructive way - without losing it or shying away from how you feel.

What Does the Brain Do? And What Does the Nervous System Do? If you've ever wondered how your brain and nervous system work, this movie has the answers!