The causes of blood clots in the stool one month after hemorrhoid surgery are normal postoperative phenomenon, local wound infection, hemorrhoid recurrence and so on. 1. postoperative phenomenon: if the patient’s hemorrhoids are more serious and larger, then the trauma left after surgery will be relatively large, when the patient’s normal defecation, it will stimulate the rectal mucosa, resulting in bleeding, which leads to the emergence of the situation of blood clots in the stool. 2. Local wound infection: as the postoperative patients need to use the anus to defecate normally, when the patient is not cleaned properly after defecation, there is fecal residue, which may trigger the wound to become infected. As a result, when the patient strains to defecate, it will cause the local inflammatory wound to worsen, and bleeding will occur, which will lead to blood clots in the stool. 3. hemorrhoid recurrence: it is possible that the patient’s surgical excision process is not complete, the remaining hemorrhoidal nuclei, which leads to a month after the operation, the patient’s hemorrhoids recurrence, which triggered the patient’s stool with blood clots. If the patient in the hemorrhoid surgery after a month of blood clots in the stool, it is recommended that the patient go to the hospital in a timely manner, improve the relevant examination, clear the cause of the disease, follow the doctor’s instructions to give treatment.