Stool quality tends to change once an individual develops colon cancer. Some people have long, thin "pencil stool," which is thinner than usual stool. In some cases, the stool's color may also be abnormal, sometimes appearing dark due to bleeding in the digestive passage; it may also contain visible blood. Such signs are hard to miss, especially if this unusual stool quality is not a one-time occurrence but persists for a long time.
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