_Anal Fistula or fissure
_Drugs such as warfarin and excessive alcohol intake
_Bleeding disorders (mainly congenital)
_Angiodysplasia (bleeding caused by continuous thining of blood vessel that line the GIT that result in their bursting).
_Malignancies especially colon cancer
_Infectious diarrhea by schistosoma, amoeba, shigella etc.
_Intussusception (that is bowel obstruction)
_Inflammatory Bowel Disease