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2. The Most Common Symptom: Bleeding

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Minor anal bleeding is an early sign of anal cancer, reported by almost a half of individuals with the disease. Hemorrhoids are a common problem and may cause rectal bleeding. In most cases, the bleeding clears up without the need for treatment. However, a physician should evaluate rectal bleeding that lasts longer than two to three weeks, especially if the individual is also experiencing weight loss or anal leakage. Even if the symptom is not caused by cancer, other serious conditions can cause it, such as Crohn's disease and ischemic colitis.

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