Appendicitis is an inflammatory lesion of the appendix formed by various factors such as obstruction of the appendiceal lumen and bacterial invasion. After the onset of the disease, patients tend to have right lower abdominal pain, accompanied by gastrointestinal symptoms such as nausea and vomiting, or systemic symptoms such as fever and malaise. There are no 6 methods to determine appendicitis clinically. The diagnosis of appendicitis is mainly based on clinical symptoms and combined with clinical examinations, such as physical examination, laboratory tests, imaging examinations, etc. Clinical symptoms: 1. abdominal pain: chronic appendicitis usually presents intermittent or recurrent right lower abdominal pain, some patients only have right lower abdominal discomfort or vague pain, and strenuous exercise will make the symptoms intensify. In contrast, acute appendicitis is mostly metastatic right lower abdominal pain, which is more intense, usually starting in the upper abdomen, gradually shifting to the umbilicus and right lower abdomen, the length of the metastasis depends on the location of the lesion and the degree of development; 2. Gastrointestinal reactions: patients in the early stage will have anorexia, nausea, mild vomiting and other symptoms. When the disease worsens, patients may have diarrhea or exhaustion, reduced defecation and other symptoms; 3. Systemic symptoms: Patients will have weakness of limbs, fatigue and sleepiness in the early stage, and when appendicitis worsens, patients will have symptoms such as accelerated heart rate, fever, sweating and chills. Clinical examination: 1. Physical examination: If there is fixed pressure pain and rebound pain at the appendiceal mike point in the right lower abdomen, the diagnosis of appendicitis can be confirmed. If there is no typical pressure pain and rebound pain, attention should be paid to identify whether it is other diseases. 2. Laboratory examination: Laboratory examination will be conducted to examine the blood picture, and the percentage of white blood cells and granulocytes, as well as whether C-reactive protein is significantly increased, as a basis for the diagnosis of appendicitis. 3. Imaging examination: Usually includes CT and ultrasound, through imaging examination, to determine whether the appendix appears to have an appearance of The imaging examination can determine whether the appendix has changed in appearance, such as whether there is enlargement and thickening. It can also help patients to determine whether there are other diseases that cause symptoms of appendicitis, such as cholecystitis, pancreatitis, ileocecal tumor and other diseases.