In the recent period, there were several cases of abdominal distension and abdominal radiographs suggesting the presence of gas and fluid in the abdominal cavity in patients under my care. Is the obstruction caused by the stitches fixed during surgery? Another case is a patient after right hemicolectomy, who was given enteral nutrition powder orally after the operation, the patient developed abdominal pain and distension, and the abdominal radiograph showed many air-fluid planes. The third case is three years after surgery for rectal cancer Mai, admitted to the hospital because there is a gas-liquid plane on abdominal X-ray, supportive treatment soon improved, the patient went for a walk in the park, the next day appeared fever, because of eating a piece of cake, the third day abdominal bulge, again abdominal X-ray found gas-liquid plane, give down the gastric tube, draw out a lot of persimmon seeds and undigested food, analysis is the food caused by obstruction, the patient had a small intestinal fistula, abdominal adhesions is inevitable, can The fourth case is a patient who ate fish sauce, undigested fish spikes accumulated in the anal opening, pain, abdominal distension, came to our outpatient clinic to give enema, abdominal dialysis has gas-fluid plane, the patient’s anal opening sphincter spasm, similar to the exit obstruction, plus enema, may be the gas-fluid plane appear The cause was repeated flushing of the intestine under anesthesia, flushing out and clamping out many fish spines, and leaving the anal tube in place after surgery to vent. These four patients caught my attention and thought. When standing, if the intestine is open, gas and water cannot be stored, and only when there is an obstruction in a certain segment does the gas-liquid plane occur, either there is indeed an obstruction, or it is a virus or bacteria or intestinal paralysis caused by early surgery, no more than these two cases, intestinal paralysis should be inaudible intestinal sounds, while early obstruction is active intestinal sounds, high-pitched or with gas-over-water sound, which are We can think of and accept the understanding, but could there be other reasons? The fish spur is blocked at the anal opening and the air-fluid level should be very low, but the abdominal ultrasound does not show this; what does the many air-fluid levels suggest? Multiple obstructions? Can we say that some of the air-fluid planes are only functional? Or at least in conjunction with a corresponding dilatation of the intestinal canal?