Activity limitation due to a physical, mental, or an emotional health problem is a broad measure of health and functioning for adolescents.  Limitations in activity are due to one or more chronic health conditions that include, but are not limited to, learning disabilities; hearing; visual, and speech problems; mental retardation or other developmental problems (such as cerebral palsy); mental and emotional problems; musculoskeletal problems; the long-term effects of injury; asthma; and diabetes.  Adolescents with one or more of these conditions often need special education services, and many receive special health services through special education programs.