The difference between acute appendicitis and chronic appendicitis

Written by Ren Zheng Xin
Gastroenterology
Updated on May 26, 2025
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Acute appendicitis and chronic appendicitis are quite different. Acute appendicitis develops suddenly with clear symptoms of fever and vomiting, and the pain in the lower right abdomen is relatively severe. Chronic appendicitis, on the other hand, often develops as a result of prolonged acute appendicitis. The abdominal pain is not typically characteristic, generally with few instances of fever or vomiting, but it can include persistent abdominal pain. Chronic appendicitis can lead to the formation of an abscess around the appendix, and a lump can be felt in the lower right abdomen. Acute appendicitis generally requires prompt surgical treatment to prevent its transition into chronic appendicitis.

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Written by Ren Zheng Xin
Gastroenterology
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The Difference Between Acute and Chronic Appendicitis

The differences between acute appendicitis and chronic appendicitis mainly lie in the onset of the condition, physical signs, and laboratory tests. First, regarding the onset of the condition, acute appendicitis occurs suddenly and can involve abrupt abdominal pain, whereas chronic appendicitis often manifests as fixed tenderness in the lower right abdomen and the symptoms are not particularly typical. In terms of physical signs, acute appendicitis presents with migratory pain in the lower right abdomen, while chronic appendicitis generally does not involve rebound pain. Thirdly, concerning auxiliary examinations, acute appendicitis shows a significant increase in the white blood cell count during an attack, whereas in chronic appendicitis, the white blood cell count may appear normal.

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Precursors of acute appendicitis

Acute appendicitis is acute inflammation of the appendix lumen, and currently, there are no particularly typical precursors, but the causes of acute appendicitis should be noted, which are related to obstruction and infection of the appendix cavity. If the appendix lumen is compressed for a long time, the accumulation of secretions can cause blood supply disorders in the distal appendix wall, directly causing damage to the appendix mucosa, and inducing infection that leads to appendicitis. Additionally, gastrointestinal dysfunctions such as diarrhea and constipation can also cause spasms of the appendix muscles and vessels, leading to blood supply disorders and mucosal damage, thereby causing acute appendicitis.

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Gastroenterology
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Typical symptoms of acute appendicitis

The typical symptoms of acute appendicitis include abdominal pain, which starts in the upper abdomen or around the navel and, after several hours, shifts and localizes to the lower right abdomen. Additionally, reflexive gastric spasms may cause nausea and vomiting. Due to the inflammation, the body may develop a fever, generally not exceeding 38 degrees Celsius. If the inflammation affects the parietal peritoneum, it can cause tenderness, rebound pain, and abdominal muscle rigidity. These are the typical symptoms, and a preliminary diagnosis can usually be made based on them. Most cases require an appendectomy.

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Anesthesia methods for acute appendicitis

The anesthesia method for acute appendicitis is related to the type of surgical treatment. If laparoscopic appendectomy is chosen, general anesthesia is usually required. If a traditional McBurney point incision is used for appendectomy, spinal anesthesia is primarily chosen. Additionally, after anesthesia, gastrointestinal function will be somewhat restricted. Until there is no gas or bowel movement from the rectum, patients should not eat after surgery. Only when the rectum starts to pass gas, indicating that gastrointestinal function is beginning to recover, can the patient begin to consume soft foods.

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Gastroenterology
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How is acute appendicitis treated?

Acute appendicitis treatment primarily involves surgical methods, where the inflamed, suppurative, or perforated appendix is excised during the procedure, and then the base of the appendix is sutured. Moreover, if there is suppuration, it is necessary to irrigate the peritoneal cavity to prevent intra-abdominal infections. After the surgery, fluid therapy should be administered based on the patient's condition. In cases of perforation or suppuration, antibiotics should be used post-operatively. For simple appendicitis, post-operative fluid replenishment is generally sufficient, and antibiotics are not required. (Please use medications under the guidance of a doctor.)