Are bright red bloody stools that cleared up after 3 days a concern? lower back pain started at about the same time. clean colonoscopy 2 years ago.

You might get more: Than one medical recommendation on this one. Because it was apparently associated with back pain - i would recommend having it checked out. This is because, I am not making the assumption that it was due to constipation, hemorrhoids, fissure, abraided tissue etc.

Not normal, get help: Blood in stool is a warning sign. Brisk bleeding warrants emergency care. Causes of bleeding may be predictable (e.G rectal trauma), but evaluation is always appropriate. A rule of thumb (but not absolute): black stool means bleeding comes from upper GI tract; grape jelly stool from small bowel; silver stool from biliary tree; burgundy stool from right colon; red blood from left colon to anus.