Generally, chronic cholecystitis with mild symptoms does not require fasting and water fasting; for acute cholecystitis, especially after surgery, fasting and water fasting should be done. 1. Chronic cholecystitis: It is a persistent and recurrent chronic inflammatory process of the gallbladder, usually caused by long-term gallbladder stones and bacterial infection. Patients may be asymptomatic or experience abdominal distension, right upper abdominal discomfort or pain after a full meal or eating fatty foods. Abdominal pain usually lasts for a few hours and can be relieved on its own, and usually does not require fasting and water retention. 2. Acute cholecystitis: often caused by obstruction of the gallbladder duct and bacterial infection, it is a common acute abdominal disease in surgery, with acute onset and rapid progression of the disease, which often results in gallbladder necrosis, pus accumulation and perforation. The main manifestation is pain in the upper abdomen, which may be accompanied by chills and high fever, etc. Surgical treatment should be carried out in time. Acute cholecystitis and its postoperative need to fasting and water, until the basic recovery of gastrointestinal function, the condition is relatively stable, and then choose a high-carbohydrate or liquid diet, be sure to avoid stimulating or fatty food intake.