Distinguish between acute appendicitis and chronic appendicitis can be carried out from the etiology, clinical symptoms, imaging and other aspects. 1. Etiology: acute appendicitis is an infection of the appendiceal lumen caused by obstruction and bacterial invasion of the appendiceal wall; chronic appendicitis is a chronic inflammatory lesion of the appendix that remains after the acute appendiceal inflammation subsides. 2. Clinical symptoms: acute appendicitis is acute onset, the patient may appear acute abdominal pain, chills, fever, nausea and other symptoms, the right lower abdomen has a fixed pressure point; chronic appendicitis can often have the right lower abdominal pain, but also can be accompanied by loss of appetite, discomfort after meals, abdominal distension, constipation, diarrhea and other symptoms. 3. Imaging examination: Acute appendicitis through ultrasonography or CT examination, can see the appendix is enlarged, and the number of white blood cells and neutrophils increased; chronic appendicitis through X-ray barium meal, ultrasound and other examinations, showing that the appendix is deformed, twisted, appearing more than one segment, with signs of filling defects. It is recommended that patients with appendicitis should seek medical attention when right lower abdominal pain occurs and follow medical advice.