Pulling blood clots may be rectal cancer, or it may be caused by peptic ulcer, hemorrhoids and so on. 1. Rectal cancer: Early symptoms of rectal cancer patients will show symptoms such as change of bowel habit, change of shape of bowel movement, etc., as well as symptoms such as pulling blood clots, weight loss and fatigue. 2. Peptic ulcer: if peptic ulcer bleeds, the blood which is not completely vomited will be discharged with peristaltic movement of digestive tract, and there will be pulling blood clots. 3. Hemorrhoids: the early symptoms of hemorrhoids are painful defecation, anal itching, and even accompanied by bleeding symptoms, so pulling blood clots may also be caused by hemorrhoids. It is recommended that if the situation of blood clots, to go to the hospital in a timely manner for a systematic examination, a clear diagnosis, and then targeted to give treatment, to avoid delaying the aggravation of the condition.