Rectal concave effusion is a relatively common clinical symptom, and generally according to the different reasons why patients develop rectal concave effusion, different treatment methods can be taken clinically. 1, if patients suffer from trauma after the rupture of the liver and spleen, a large amount of accumulated blood stagnates in the pelvic rectal concave, at this time, patients often show serious symptoms of hemorrhagic shock, requiring diagnostic laparotomy, and if the accumulation of blood in the abdominal cavity is found, it is recommended that as soon as possible The patient will have abdominal muscle tension, abdominal pressure pain, rebound pain peritonitis performance. 2, some patients due to perforation of the abdominal gastrointestinal tract, and caused digestive fluid infiltration into the abdominal cavity, the rectal concave purulent effusion, then the patient will appear abdominal muscle tension, abdominal pressure pain, rebound pain peritonitis performance. At this time, patients need to perform emergency surgery as soon as possible to repair the perforation of the digestive tract, clean up the abdominal cavity infectious lesions, and strengthen anti-infective rehydration support therapy after surgery, most patients can fully recover after two weeks.