Crohn's disease is a condition that causes parts of the intestine (bowel) to get red
and swollen. It can be challenging to deal with, but many teens find that they're
able to feel well and have few symptoms for long periods of time.
You've probably heard lots about sexually transmitted diseases. The good news is that
STDs can be prevented. For information on how to protect yourself and how to treat
genital warts, read this article.
The immune system is made up of special cells, proteins, tissues, and organs that
defend people against germs and microorganisms. It's the body's defense against organisms
and substances that invade our systems and cause disease.