Intellectual disability affects about 1% to 3% of the population. There are many causes of intellectual disability, but doctors find a specific reason in only 25% of cases. Risk factors are related to the causes. read more
Anytime something interferes with normal brain development, intellectual disability can result. However, a specific cause for intellectual disability can only be pinpointed about a third of the time. The most common causes of intellectual disability are: Genetic conditions. read more