Mixed hemorrhoids external stripping and internal ligation surgery after anal swelling may be due to anal abscess, surgical trauma. 1. Anal inflammation: the external peeling and internal ligation surgery will cause wounds to the patient’s anus, and the patient’s lack of cleanup after defecation or improper wound care may cause infection and inflammation at the anus wounds. Under the repeated stimulation of inflammation, anal abscess will appear, which will make the anus appear swelling, pain and other symptoms, some patients will also be accompanied by obvious anal swelling, blood in the stool. 2. Surgical trauma: mixed hemorrhoid patients in the external peeling and internal ligation surgery left behind the wound will stimulate the perianal nerve, so that the sensitivity around the anus increased, under the stimulation of the mutation, the patient will appear in the anus swelling symptoms, clinically common, with the improvement of the condition after the operation, the symptom slowly alleviate. After hemorrhoid surgery, if the symptoms of anal swelling are serious, the attending physician should be informed in time, and the examination should be given for appropriate treatment to avoid aggravation of the condition.