In normal people, there is a small amount of fluid in the abdominal cavity, about 30-50 ml, not more than 100 ml, which serves as a lubricant. Abdominal fluid secondary to pathology is commonly caused by inflammation and can be cured with systematic anti-infective treatment. It is more common in patients with inflammation of the gynecological system, ovarian abscess or adnexitis, there will be obvious pain in the lower abdomen, and if a pelvic abscess is formed, it will also be accompanied by a sense of urgency and heaviness, and the patient will also have a fever. In addition to anti-infective treatment, if the abscess is obvious, surgery can also be chosen to drain the abdominal cavity. In addition, intestinal tuberculosis patients will also be secondary to abdominal effusion, the patient will also have obvious low fever, fatigue, night sweats and other manifestations of tuberculosis poisoning, this situation requires systematic anti-tuberculosis treatment, and usually can be cured.