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What causes irritability and mental retardation? 4 possible conditions

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



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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Lead Poisoning

Lead poisoning occurs when lead builds up in the body. It is serious and sometimes fatal. Lead can be found in paint, art supplies, and other items. Poisoning may cause severe abdominal pain, seizures, and more.

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Huntington's Disease

Huntington's disease is a hereditary condition in which the brain's nerve cells gradually break down. This affects physical movements, emotions, and cognitive abilities. There is no cure, but there are ways to cope wit...

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Tay-Sachs Disease

Tay-Sachs is a disease of the central nervous system; it is a neurodegenerative disorder. Tay-Sachs most commonly affects infants. In infants, it is a progressive disease that is unfortunately always fatal. Rarely...

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