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The rectal bleeding
after bowel movement is commonly due to hemorrhoids. The hemorrhoids have 3 grades and each grade have its treatment accordingly. The first grade is commonly treated with drug treatment or banding ligation and the later two requires surgical removal.
Therefore you are recommended to visit a general surgeon
for a detailed proctoscopy to grade your disease and receive the appropriate treatment accordingly.
For pain relief you can use troncance gel which is a local anesthetic
and applied per anal.