Asymptomatic blood in the clinical specific causes include internal hemorrhoids, mixed hemorrhoids, colorectal tumors, polyps and gastrointestinal bleeding, as follows: First, internal hemorrhoids, mixed hemorrhoids: clinical more common is internal hemorrhoids, mixed hemorrhoids lead to blood in the stool, this situation is more common in the clinic, most of them are due to the rupture of the hemorrhoid nucleus or constipation, the hemorrhoid nucleus produces stimulation and cause blood in the stool without symptoms, often after the new fresh blood, the blood in the stool. Often, fresh blood comes out after the bowel movement. Second, colorectal tumors, polyps lead to: may be colorectal tumors or polyps and lead to bleeding, this situation in the early occurrence of no symptoms. Third, caused by gastrointestinal bleeding: for asymptomatic blood in the stool, it may be caused by gastrointestinal bleeding, which usually occurs more urgently, sometimes causing a large amount of bleeding in a short period of time and causing the corresponding symptoms. These are the common causes of asymptomatic blood in stool.