Difficulty in defecation stools become thin, there is blood may be hemorrhoids caused by anal fissure, rectal tumors and other causes can not be ruled out. 1. Hemorrhoids: If you sit and stand for a long time, and often eat spicy and stimulating food, it may lead to dry stools and difficult to lift, and in severe cases, it will induce the formation of hemorrhoids, which may cause difficulty in defecation, accompanied by symptoms such as thinning of stools with blood. 2. Anal fissure: anal fissure usually refers to a situation where the digestive tract outlet from the dentate line to the surface of the anal canal tissue is cracked, which will lead to the patient to have difficulty in defecation, thin stools, accompanied by blood and severe pain and other symptoms. 3. Rectal tumor: If the rectum grows a tumor, it may lead to the narrowing of anal canal or rectum, which may cause the symptoms such as difficulty in defecation, thinning of stools, blood and so on. It is recommended to go to the hospital for examination and colonoscopy if necessary, so as to clarify the cause of the disease and treat it in time.