Fever on bleeding from anal fissure indicates that the patient may have an inflammatory infection, which in turn causes a high body temperature. In this case, blood should be drawn to check the blood routine, to see if there are white blood cells or neutrophils are elevated. If there is elevated, it means that there is inflammation in the body, or it may be bleeding anal fissure which leads to localized infection, or there is perianal abscess and other lesions, which causes the temperature to be feverish. For this situation, generally first physical cooling, can use fever reducer or alcohol wipe local relief, while drinking more water. If there is inflammation, you may need to take some drugs such as cephradine or cefixime dispersible tablets for anti-inflammatory treatment, together with diclofenac sodium pessary internal anal plug, to play the effect of anti-inflammatory and analgesic. For anal fissure bleeding, you need to choose nitroglycerin ointment or Longzhu ointment topical external application.