Acute appendicitis is primarily characterized by severe pain in the lower right abdomen with pain levels of 5-7. Pain is generally categorized on a scale of 1-10, while acute appendicitis can have pain levels of 5-7. The pain changes as the disease progresses. 1. At the initial stage of acute appendicitis, the pain level is generally 5, at this time the pain caused by the human body can be tolerated, will not have a greater impact on all aspects of life, in addition to pain, will be accompanied by varying degrees of anorexia, vomiting and other discomforts. 2. Acute appendicitis occurs in the middle stage, the pain level is generally 6, at this time there will be lower right abdominal pain, the abdomen will also appear pressure pain, the pain caused by the human body can not tolerate, affected by it can not normal activities. 3. Acute appendicitis occurs in the late stage, the pain level is generally 7, at this time there will be severe pain, severe cases may be shock. Therefore, acute appendicitis patients need to choose to seek medical treatment as soon as possible, after scientific examination, early treatment to avoid aggravation of the condition.