Irritability, Mental retardation: 4 Possible Causes
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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 is a toxic metal and a very strong poison. Lead poisoning is serious and sometimes fatal. Discover the causes, treatments, and tips for prevention.

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Huntington's Disease

Huntington's disease is a hereditary condition in which your brain's nerve cells gradually break down. It can cause physical and psychological symptoms.

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Tay-Sachs Disease

Tay-Sachs disease is a neurodegenerative disorder most commonly found in infants. Learn more about this rare disease.

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Please consult a healthcare professional if you have health concerns.