Men usually have abdominal distension and pain for several reasons: First, the most common factor is gastroenterology diseases, such as acute gastroenteritis, especially colitis, colitis, etc. will appear distension and pain in the small abdomen. In addition, such as cholecystitis, septic cholangitis, acute diffuse pancreatitis can appear the clinical symptoms of abdominal distension. Second, the male abdominal distension will also have urological diseases, such as renal ureteral stones, acute cystitis and acute prostatitis, especially acute prostatitis will feel the abdominal distension and pain. Third, common general surgery diseases, such as acute suppurative appendicitis, acute peritonitis, acute gastrointestinal perforation, acute intestinal obstruction will appear significant abdominal distension.