Hi and thanks for using healthcaremagic, blood in stool is a common symptom in everyday practice. The causes are multifactorial and exact diagnosis usually entails a good clinical examination which on its own can be sufficient for a diagnosis. Diseases such as hemorroids, parasitic infections like the hip worm (enterobius vermicularis), dryness and fissures are the commonest causes. Other causes like gastointestinal tract hemorrage must also always be borne in mind. In the elderly, its often required to exclude tumours like tumours of the colon or sigmoid colon. A stool examination in search of parasites and depending on the physical examination, rectal examination and endoscopic evaluation should be enough to make an appropriate diagnosis. I suggest you get an appointment with your primary care physician for a proper evaluation and management. Thanks and hope this helps, Luchuo, MD.