Appendicitis temperature of 40 degrees is usually caused by inflammation of the organism. Appendicitis is usually an inflammatory lesion caused by obstruction of the lumen of the appendix, bacterial infection, gastrointestinal dysfunction, etc. Patients may experience varying degrees of fever, which may exceed 38 degrees Celsius in the early stages, and can reach 40 degrees Celsius in the case of concomitant appendiceal perforation. Patients with appendicitis may also experience metastatic right lower abdominal pain, paroxysmal abdominal distension, persistent severe abdominal pain, signs of peritoneal irritation, and nausea. When the symptoms of appendicitis appear, it is important to go to the hospital in time and take relevant treatment under the guidance of the physician, so as to avoid delaying the condition, which may lead to complications such as abdominal abscess, internal fistula, external fistula, and suppurative portal phlebitis.