Potential or coincidental causes for blood in stool?

Many : From benign like hemorrhoids to serious like cancer. Can't tell without an evaluation. I suggest you visit your family doc and let he/she take it from there.

Blood in stool: Possible causes of blood in stool include: fissures, fistulas, hemorrhoids, cancer, ulcers, infections, inflammation, Diverticular disease & Angiodysplasia . Get evaluated if more than a one time occurrence.