In this condition, a genetic male has an extra X sex chromosome. This may affect the growth of testicles and result in low testosterone.
Disease
Thalassemia
Some forms of this inherited blood disorder usually show up before the age of 2. Often, they cause anemia. Worse forms of the disease require regular blood transfusions.
Disease
Norovirus infection
This highly contagious virus spreads through contaminated food, water or surfaces and causes vomiting and diarrhea. Learn ways to protect yourself.
Disease
Porphyria
This group of disorders results from a buildup of natural chemicals in the body that affect the nervous system and skin. Learn how to avoid symptom triggers.
Disease
Adrenoleukodystrophy
Find out about diagnosis and treatment of adrenoleukodystrophy — a hereditary disorder that affects the brain, nervous system and adrenal gland.
Disease
Microcephaly
Learn more about microcephaly, when an infant's head is smaller than expected. The condition affects child development.
Disease
Mumps
Find out more about the symptoms and treatment of this viral illness and how vaccines can prevent it.
Disease
Toe walking in children
Walking on toes or the balls of the feet is fairly common in children who are learning to walk. Most children outgrow it.
Disease
High blood pressure (hypertension)
Learn the symptoms and treatment of this condition — which raises the risk of heart attack and stroke — and the lifestyle changes that can lower the risk.
Disease
Elevated blood pressure
If your blood pressure is slightly elevated, eating better and moving more can help prevent prehypertension from becoming high blood pressure.
Disease
Heart arrhythmia
Learn about common heart rhythm disorders that can cause your heart to beat too fast, too slow or irregularly.
Disease
Mitral valve disease
Learn more about diseases that affect the valve between the left heart chambers, including mitral valve regurgitation and mitral valve stenosis.