The absence of bowel movement 2 days after anal fissure surgery may be related to the dryness of stool, or may be caused by intestinal dysfunction, adhesive bowel obstruction and other reasons. 1. Stool dryness: 2 days after anal fissure surgery, the wound is still in the recovery period, and the patient is afraid of defecation which may cause pain on the wound surface, so the patient usually refuses to defecate intentionally, which may easily lead to stool dryness, and thus there is no defecation for 2 days. 2. Intestinal dysfunction: after anal fissure surgery, in order to reduce the frequency of defecation, patients will often reduce dietary intake, coupled with the torture of the disease, resulting in poor mental mood, which can easily induce intestinal dysfunction, which may occur after anal fissure surgery 2 days without defecation. 3. Adhesive intestinal obstruction: after anal fissure surgery, adhesive intestinal obstruction is likely to be induced, which will lead to the cessation of defecation and evacuation, and then there will be no defecation for 2 days. If there is no bowel movement for 2 days after anal fissure surgery, and if there is obvious discomfort, it is recommended to inform the doctor in charge as soon as possible to diagnose the cause of the disease, and then give targeted treatment and adjustment to avoid aggravation of the condition.