Hemorrhoid surgery and then out of the blood clots may be due to improper surgical operation, improper bowel movement or improper care. 1. Improper operation: In the hemorrhoid surgery, if the operation is not proper, the lymphatic system around the anus as well as the blood system may be damaged, resulting in lymphatic fluid or blood stagnation, cohesion, and thus thrombosis. 2. Improper defecation: premature defecation, poor defecation or hard stool after hemorrhoid surgery may cause irritation to the local wounds, resulting in bleeding and coagulation of capillaries around the anus to form blood clots. 3. Improper care: patients in the post-surgery local wound care is not appropriate, or surgery is not completely cleaned up residual, may cause local wound infection, resulting in surgical wounds at the blood and pus coagulation into thrombus. Hemorrhoid surgery and then thrombus, should be timely to the hospital or follow-up, by a professional doctor to check the condition, give targeted treatment, to avoid aggravation of the condition.