Adult intellectual and developmental disabilities (IDDs) are lifelong conditions that affect a person’s intellectual, physical, or both types of development, resulting in substantial limitations in daily life activities. These disabilities, which originate before adulthood, manifest in areas like self-care, communication, learning, and independent living. Management involves early intervention, ongoing support, and person-centered services tailored to the individual’s needs to improve their quality of life and social inclusion.
Key characteristics
Manifestation: Symptoms and limitations appear in the developmental period, from birth to early adulthood, and are likely to continue indefinitely.
Functional limitations: IDDs result in significant functional limitations in at least three major life activity areas, such as self-care, language, learning, mobility, self-direction, and economic self-sufficiency.
Types: Developmental disabilities are a broader category that includes intellectual disabilities (characterized by limitations in intellectual functioning and adaptive behavior) as well as physical disabilities like cerebral palsy and epilepsy.
Spectrum of severity: The severity of IDDs varies widely, from mild to profound, meaning the level of support needed can differ significantly from person to person.
Management and support
Early and ongoing intervention: While a lifelong condition, early and consistent support can significantly improve functioning and outcomes throughout an individual’s life.
Person-centered services: Services should be tailored to individual preferences to support personal goals and enhance well-being. This includes active participation in developing service plans.
Support systems: Support coordinators can help adults with IDDs and their families identify life goals and navigate available services, including healthcare, social services, and community programs.
Social inclusion: Promoting a sense of belonging through participation in social activities and community life is crucial for an individual’s well-being.
Common causes
Genetic conditions: Examples include Down syndrome and Fragile X syndrome.
Pregnancy and birth complications: Factors such as maternal disease, infection during pregnancy, or lack of oxygen during childbirth can contribute.
Acquired conditions: Illnesses like meningitis or head trauma during childhood can also lead to IDDs.
Environmental factors: Exposure to toxins like lead or mercury can be a contributing factor.