Could someone please tell me the exact reason for anal cancer??

My granma is suffering from anal cancer and we know her life is coming to an end. Why does it happen. Can't see anyone with so much pain and struggle. Could someone please tell me the exact reason for anal cancer??
Comments
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sushan
I'm sorry that your grandmother has been diagnosed with anal cancer. There are several risk factors for the disease. Please click on the link I've provided below that will take you to a website that may answer your questions. I wish your grandmother all the best.
http://www.cancer.org/cancer/analcancer/detailedguide/anal-cancer-risk-factors
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