May Be Caused by

 Common

Atropine

Dermatomyositis

Immobilization

Lomotil

Morphine

Normal variant

Postoperative state

Pro-Banthine

Scleroderma

Sentinel loop

Systemic lupus erythematosus

Vagotomy

 Uncommon

Aerophagia

Chagas disease

Diabetes mellitus

Diabetic coma

Diabetic ketoacidosis

Emotional state alteration

Hyperventilation

Insulin shock

Late-stage paralytic strongyloidiasis

Lead colic

Malabsorption syndromes

Porphyria

Sprue

Tabetic crisis

Thiamine deficiency neuropathy

Zollinger-Ellison syndrome