 [ Symptoms ] i am only 19 and this morning i saw blood in my stool what could be the cause i do not have anal sex i feel no pain [ Disease ] if the blood was bright red then it is likely from a hemorrhoid or fissure darker older looking blood can be from higher up in the intestinal tract and black tarry blood is usually from the stomach do not panic there is a good chance that this is an innocent finding but you will need to be examined to determine the exact source of the blood