Intellectual Disability And Other Psychiatric Disorders

Individuals with intellectual disabilities are also prone to mood disorders. One mood disorder is major depression. It is difficult to determine the precise rate of co-morbidity. This is because many people with ID have difficulty communicating their moods. This makes diagnosis of mood disorders, such as depression, more difficult. Both adults and children with ID may experience depression. Children can get depressed when they realize they are different from their peers. For instance, they may notice they do not have same skills and abilities as their peers. Adolescents and adults with ID also get depressed. Disturbances in sleep and eating routines, social withdrawal, and anxiousness can indicate depression. Discover your mental health strengths and weaknesses with an online mental health quiz.
Bipolar disorder is another mood disorder. People with ID are two to three times more likely to be diagnosed with bipolar disorder than the general population.
A diagnostic criterion for ID is onset before age 18. If symptoms develop after age 18, the correct diagnosis is neurocognitive disorder (formerly dementia). However, a person with ID can receive both diagnoses if a further loss of functioning occurs after age 18. This may be due to a new brain injury (e.g., auto accident). Alternatively, a progressive brain disease or disorder may develop. Typically, people with ID are not at greater risk for neurocognitive disorders later in life. However, if the ID is caused by Down syndrome, early onset Alzheimer’s disease is common. When people with Down syndrome develop Alzheimer’s, they usually don’t live more than 10 years after diagnosis.
About 3% of people with intellectual disabilities also have Schizophrenia. This is compared to 0.8% of the general population. This diagnosis is often missed.
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Further Reading
The content on this page was originally from MentalHelp.net, a website we acquired and moved to MentalHealth.com. This content has not yet been fully updated to meet our content standards and may be incomplete. We are committed to editing, enhancing, and medically reviewing all content by September 30, 2025.
MentalHealth.com is a health technology company guiding people towards self-understanding and connection. The platform provides reliable resources, accessible services, and nurturing communities. Its purpose is to educate, support, and empower people in their pursuit of well-being.