Teen health
Learning Center
Enlarged breasts in men (gynecomastia)
Learn how an imbalance of the hormones estrogen and testosterone can cause breast tissue swelling in boys or men.
Bacterial vaginosis
Learn about symptoms, treatments and prevention of this common vaginal condition.
Heart valve disease
Learn about this condition in which one or more of the heart valves doesn't work properly.
Chiari malformation
Learn about this brain condition in which brain tissue extends into the spinal canal.
Double uterus
Learn about symptoms, diagnosis and treatment of this uncommon condition of the uterus. It is present at birth.
Epilepsy
Learn about this condition that causes seizures. Find out which symptoms are associated with different types of seizures and how they're treated.
Conjoined twins
If an early embryo only partially separates and two babies develop, they remain physically connected — most often at the chest, abdomen or pelvis.
Cerebral palsy
Learn about this group of conditions that affect movement. It's caused by damage to the developing brain, usually before birth.
Bicuspid aortic valve
This condition, present at birth, affects the valve between the lower left heart chamber and the body's main artery. Know the symptoms and treatment.
Perimenopause
Discover effective treatments and learn self-care strategies for hot flashes, night sweats, vaginal dryness and other perimenopause symptoms.
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