Bloody stool may be caused by a variety of conditions, including cancer. Find out when to worry about blood in stool and when to call a doctor. Blood in Stool (Hematochezia): Learn causes of bloody stools, the tests to diagnose the underlying problem, & treatment options. Bright red blood in the stool is not normal and can be due to a serious cause. Learn about the causes and diagnosis of bloody stool , and when to seek treatment.
