After appendicitis surgery, the fluid can drain away in 3-5 days. Appendicitis is very common and is caused by obstruction of the appendix and bacterial infection. Patients may experience abdominal pain, even with fever and abdominal distension. During physical examination, there will be a fixed pressure pain at the point of McDonald’s, and even rebound pain and muscle tension, which is a typical sign of appendicitis and the main basis for the diagnosis of appendicitis. After the diagnosis of appendicitis is confirmed, surgery to remove the appendix is preferred. If the inflammation of the abdominal cavity is heavy, an abdominal drainage tube needs to be placed, which can prevent the accumulation of fluid in the abdominal cavity and can promote the flow of fluid out of the body. In general, the fluid can be cleaned up in 3-5 days and the abdominal drainage tube can be removed. After the occurrence of appendicitis, it is necessary to improve the relevant examination in a timely manner. If there are no contraindications to surgery, surgery can be performed. If the patient is not well enough to undergo surgery, anti-inflammatory treatment, such as intravenous antibiotics, is required.