Effect of Osteopathic Manipulative Medicine on Constipation in Parkinson's Disease

Inclusion Criteria: * Medically diagnosed with Parkinson's disease * Medically diagnosed with constipation (according to Rome III criteria) * Be over 40 years old Exclusion Criteria: * No diagnosis of Parkinson's disease * No diagnosis of constipation that satisfies Rome III criteria * Medically diagnosed with irritable bowel syndrome * Another diagnosed cause for chronic constipation * Currently pregnant * Have another diagnosed neurologic condition (excluding headache or migraine, headache, migraine, dysautonomia, depression or other mood disorders (unless severe or uncontrolled), dementia or cognitive changes (unless severe), diffuse lewy body dementia, REM sleep behavior disorder, normal pressure hydrocephalus, multiple system atrophy P and C types, progressive supranuclear palsy, vascular parkinsonism, corticobasal ganglionic degeneration, and drug induced parkinsonism) * Spinal cord abnormality or lesion * Cancer of the gastrointestinal tract, abdomen, or pelvis * Anemia that has not been evaluated * Unexplained weight loss, fever, night sweats, rectal bleeding, or black stools in past 2 months * Active hepatitis, infectious mononucleosis, or enlarged spleen * Abdominal aortic aneurysm * Congenital malformation of the gastrointestinal tract * Abdominal or pelvic surgery within the past 6 weeks * Unable or unwilling to receive OMT. * Unable or unwilling to rate one's own stools using a visual chart or to bring a picture of one's stool to each visit