What Is Down Syndrome?
Down syndrome is a chromosomal condition related to
chromosome 21. It affects 1 in 800 to 1 in 1000 live born
infants.
People who have Down syndrome have learning difficulties,
mental retardation, a characteristic facial appearance, and
poor muscle tone (hypotonia) in infancy.
Individuals with Down syndrome also have an increased risk
for having heart defects, digestive problems such as
gastroesophageal reflux or celiac disease, and hearing
loss.
Some people who have Down syndrome have low activity of the
thyroid gland (hypothyroidism) - an organ in the lower neck
that produces hormones.
Health
Related Websites
The National Cancer
Institute
The National Eye
Institute
The National Heart, Lung,
and Blood Institute

National Institute on
Aging

National Institute of
Allergy and Infectious Diseases

National Institute of
Arthritis and Musculoskeletal and Skin Diseases

National Institute of
Diabetes and Digestive and Kidney Diseases

National Institute on Drug
Abuse

National Institute of Mental
Health

National Institute of
Neurological Disorders and Stroke
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