Common Medical Etiologies for Behavior Changes 
by Kerrie Seeger, M.D.

Many people with developmental disabilities have communication difficulties in regards to their needs, pain, and emotional states,. Changes in their behavior can also be the only clue that they have underlying medical problems. A careful investigation for common medical illnesses is necessary before attributing behavior to another etiology and, because of syndromes; a medical search for uncommon illnesses may be needed.

Acute changes in behavior can reflect discomfort such as fever, urinary tract infection, constipation, sinusitis, otitis media and headaches. Because expression of pain is difficult for some people with developmental disabilities, even fractures, cellulitis, and trauma related injuries might be missed.

Silent etiologies of behavior changes include diseases such as gastroesophageal reflux disease (GERD). This is more common in the DD population with an IQ less than 50. A recent study showed that the incidence of GERD leading to Barrette's esophagitis and even to esophageal cancer is many times that expected in a non-disabled population. Neurological injuries causing the mental retardation, spasticity or contractures which necessitate unusual positions while eating (or feeding), and psychotropic medication all contribute. Aggressive treatment of GERD is warranted starting with H2 inhibitors and even the consideration of surgery if medications do not adequately relieve symptoms.

Endocrine disorders also need to be considered. The life long incidence of thyroid disease in people with Down Syndrome is 30-35%. Current recommendations are for screening with a TSH yearly. Diabetic screening is also warranted.

Hepatitis B and C screening (and hepatitis B immunization) are important - many individuals have had surgical procedures and possible blood transfusions during their childhood. People with developmental disabilities also have a higher incidence of being sexually abused.

Osteoarthritis and osteoporosis are very common and need to be treated as well as considered preventively. For example, make sure that wheelchair seating, bed and transfer minimize pain. The use of Fosamax, calcitonin and Vitamin D are appropriate as well as postmenopausal hormone replacement for women.

Although rare in the general population, vitamin deficiencies (ex. thiamine B1, B12, B6) must be considered in a DD population (inadequate diet, medications, and anatomic abnormalities), especially because of the treatable and reversible consequences.

Review of patient's medication is important because of drug-drug interactions. Often people with developmental disabilities are on multiple medications and may be more sensitive to side effects.

Similar to complicated geriatric patients, the diagnosis and treatment of medical illnesses in people with developmental disabilities are on multiple medications an may be more sensitive to side effects.

Similar to complicated geriatric patients, the diagnosis and treatment of medical illnesses in people with developmental disabilities are challenging, but very rewarding when quality and enjoyment of life can be enhanced.