what is the amount of blood to worry with

Blood in the stool is an abnormality, so any amount of blood needs to be evaluated by a physician. One might notice blood when wiping after a bowel movement, specks of blood in the stool or dark stools. Sometimes, there is no visible blood,. This is called occult blood and is noted on a special test. This is why it is important to have a colonoscopy after the age of 40 or sooner if there is a family history of colorectal cancer.