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Amenorrhea in Adolescents and Teens What is amenorrhea? Amenorrhea is a menstrual condition characterized by absent menstrual periods for more than 3 monthly menstrual cycles. Amenorrhea may be classified as primary or secondary: Primary amenorrhea. From the beginning and may be

Sleeping Positions During Pregnancy As your pregnancy progresses and your uterus gets bigger, you may find it harder to get comfortable in bed. Early on in pregnancy, you can sleep on your stomach. Over time, that position can become uncomfortable. But it's OK to sleep on your

Skin Cancer: Prevention The sun sustains life and feels good, but it can be your skin’s worst enemy. While every sunburn can increase your risk of skin cancer, it’s not just those big days at the beach or ballgames that cause trouble. Each time you run out to get the mail, walk

Benign Skin Growths in Children What are benign skin growths? Children may have many types of skin growths. The vast majority of growths in children are benign. This means they are not cancer. Growths may be caused by genetics, injuries, sun exposure, or other reasons. What are

Sunscreens: Protect Your Skin What are sunscreens? Sunscreens protect the skin. They play an important role in blocking ultraviolet (UV) radiation from being absorbed by the skin. UV radiation damages the skin and can lead to sunburns and skin cancer. No sunscreen blocks UV

Cancer and Tobacco How are tobacco and cancer linked? Using tobacco makes it more likely that you will get cancer. This includes lung, mouth, throat, bladder, and other cancers. In fact, 1 out of 5 people with cancer in the U.S. got it from smoking. All tobacco products, such as

Diagnosis of Cystic Fibrosis How is cystic fibrosis diagnosed? Newborns are screened for cystic fibrosis (CF) as part of each state's newborn screening program. If the results are positive, it does not mean your baby has cystic fibrosis. More tests are done as described below. In

Maternal and Fetal Testing Overview Most people have healthy pregnancies, and their babies are born without trouble. But people with high-risk pregnancies often need to be closely watched for possible problems. Fortunately, many tests and procedures are available to keep track of

The Child's Immune System What is the immune system? The immune system protects your child's body from outside invaders. This includes germs, such as bacteria, viruses, and fungi, and toxins (chemicals made by microbes). The immune system is made up of different organs, cells

Anatomy and Function of the Heart Valves What are heart valves? The heart has four chambers: two upper chambers (atria) and two lower chambers (ventricles). Blood passes through a valve before leaving each chamber of the heart. The valves prevent the backward flow of blood