Teen health
Learning Center
Oppositional defiant disorder (ODD)
This childhood mental health condition includes frequent and persistent anger, irritability, arguing, defiance or vindictiveness toward authority.
Trachoma
Trachoma is the leading preventable cause of blindness worldwide. Find out about symptoms, treatment and prevention of this serious eye disease.
Thrombocytopenia (low platelet count)
Thrombocytopenia — Comprehensive overview covers symptoms, causes, treatment of a low platelet count.
Trichotillomania (hair-pulling disorder)
In this mental health condition, people can't resist urges to pull out hair from their body. They do this often. Therapy may help reduce or stop urges.
Bleeding after menopause: A concern?
It's unusual to bleed from the vagina after menopause. Learn what health problems can cause it and why you need to see your health care provider.
Tetralogy of Fallot
These four heart problems present at birth change how blood flows through the body. Know the symptoms and treatment.
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.
Vascular rings
Learn more about this condition in which malformations of the aortic arch encircle the windpipe and esophagus and can press against them.
Hypoglycemia
Low blood sugar can cause uncomfortable symptoms, such as dizziness and confusion, and can quickly become serious if left untreated.
Eosinophilic esophagitis
Learn more about the causes and treatment of eosinophilic esophagitis — a digestive disease caused by an allergic reaction.
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