A patient with appendicitis who has a combined abdominal or pelvic effusion, in this case it would be acute suppurative appendicitis. The most effective treatment is surgery, and surgery is mandatory. Because the appendix is a blind end, bacterial emboli may also flow back into the liver with the venous blood after suppuration, and serious complications, including portal phlebitis and liver abscesses, may also occur. In addition, the gradual aggravation of the infection in the abdominopelvic cavity may lead to an increase in fluid accumulation and even sepsis, and the patient may also have a significant feeling of urgency and fever. Blood tests, leukocytes and neutrophils may be significantly higher, and in this case conservative treatment is not effective and serious complications may easily occur. The fluid in the abdominopelvic cavity should be carefully removed during surgery to provide more convenient treatment after surgery, and after surgery, symptomatic support treatment such as anti-infection and intravenous rehydration should be routinely provided.