The first step in diagnosis is to determine the etiology of<unk> . After making a differential diagnosis of<unk> , it is important to take a careful medical history. Here are the most common causes of<unk>  classified as an underlying cause and as a secondary disease. As an underlying disease cause: *Constipation *Lactose intolerance and other food intolerances *Overeating (due to overproduction of gases in the digestion process) As a secondary disease cause: *Celiac disease *GERD (gastroesophageal reflux disease) *Peptic ulcer disease *Accumulation of fluid in the peritoneal cavity (e.g., ascites)
Abdominal distension
Gallbladder flush
Blood in stool
Abdominal pain
Abdominal guarding
Rectal discharge
Nipple discharge
Fecal vomiting