Detailed information on how the digestive system works, including a full-color, labeled illustration of the digestive system.
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The anus is the last part of the digestive tract. Learn more about its anatomy, including where anal cancer is likely to start.
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Anal cancer is cancer that starts in the cells of the anus. Learn more about this type of cancer.
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Sometimes anal cancer does not cause any symptoms at all. Bleeding from your rectum is the most common symptom of anal cancer.
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