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What causes developmental delay and mental retardation? 8 possible conditions

See a list of possible causes in order from the most common to the least.

1

Mental Retardation

If your child has an intellectual disability (ID), their brain doesn't develop properly. Their brain may also not function within the normal range of both intellectual and adaptive functioning. In the past, medica...

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2

Down Syndrome

Down syndrome is the most common genetic condition in the United States. It causes physical and mental developmental delays and disabilities.

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3

Cerebral Palsy

Cerebral palsy is a group of disorders that affect muscle movement and coordination. Learn about the causes, types, symptoms, and treatment of cerebral palsy.

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4

Hydrocephalus

Hydrocephalus is a condition that occurs when fluid builds up in the skull and causes the brain to swell. The name literally means "water on the brain."

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5

Muscular Dystrophies

Muscular dystrophies are a group of inherited diseases that damage and weaken your muscles over time. This damage and weakness is due to the lack of a protein.

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6

Homocystinuria

Homocystinuria is an inherited disorder that keeps the body from processing the essential amino acid methionine. Amino acids are the building blocks of protein.

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7

Phenylketonuria

Find information on phenylketonuria causes, symptoms, diagnosis, and treatment.

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8

Tuberous Sclerosis

Tuberous sclerosis is a rare genetic condition that causes noncancerous tumors in your brain, other organs, and skin. Learn how it's treated.

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This feature is for informational purposes only and should not be used to diagnose.
Please consult a healthcare professional if you have health concerns.
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