Small belly drop is related to bacterial infection, urinary tract infection, pelvic inflammatory disease, dysmenorrhea, prostatitis and other diseases. Causes of small abdominal cramps more reasons: First, poor eating habits, small abdominal cold and other factors are prone to intestinal spasmodic pain, so there will be a small abdominal cramps, through the local hot compresses, massage can be significantly improved. Second, the urinary system infection caused by bladder infection, bladder mucosal injury will lead to abdominal distension, urinary frequency, urinary urgency and other manifestations. Third, long-term chronic stimulation of pelvic inflammatory disease can cause local adhesions and abdominal distension. Fourth, gynecological tumors, pelvic tumors can also cause abdominal distension. Fifth, abdominal pain during menstruation is considered to be caused by dysmenorrhea, to do a good job of abdominal warmth. In addition to the male abdominal distension, may be related to prostatitis, cystitis, orchitis. So no matter whether men or women, once the abdominal pain, timely to the hospital ultrasound examination can be clearly diagnosed.