Do bright red blood found on tissue aft defecate means sth serious? especially since you usually have either diarrhea or have blood on tissue

Hemorhoid ?: The most likely source is from a hemorhoid but it can be from other causes including excessive cleansing when you have diarrhea. It is not a bad idea to discuss this with your doctor.

Read Red Flagg below: Should undergo additional testing regardless of age:all need colonoscopy :(minimal brbpr=bright red blood per rectum): patients with fecal occult blood positive stools, .Patients with family histories suggestive of familial polyposis or hereditary nonpolyposis colon cancer syndrome, a change in bowel habits, suggestive of malignancy, dark red blood per rectum.All above should undergo colonoscopy