What leads to blood with loose stool?

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Blood in stool is not a normal condition as you are having the problem for one year. It should be investigated in detail and the following work-up will be useful. Rectal, anal area examination, stool routine microscopic examination, proctoscopy examination, colonoscopy, if needed. If needed during colonoscopy, a biopsy is taken from the abnormal area if found for a histopathology examination.

This work-up will be helpful to rule out causes for blood in stool like a polyp, proctitis, piles, colitis, diverticulitis, any growth, if present, etc. If the color of blood in stool is of brown-red color then bleeding is from the upper gastrointestinal tract. If the colour is bright red then the cause for bleeding is from the lower gastrointestinal tract. So, from your provided history, this work-up should be done and the above causes should be ruled out. One diagnosis cannot be given. Consult a general surgeon or gastroenterologist for examination and above work and according to the cause identified further treatment plan can be decided.