Abdominal pain or bloating
Nausea and vomiting
Obstipation
Agitation/confusion (elderly patients with neuropsychiatric conditions)
Urinary incontinence
Overflow stool incontinence
Abdominal distention and/or tenderness
Palpable firm stool balls on digital rectal exam
Fecal impaction
Behavioral-related
Rectal foreign body
Lack of exercise
Volvulus 
Diet-related
Volvulus
Clogged G-tube