While both constipation and diarrhea can indicate colorectal cancer, they are also common symptoms of irritable bowel syndrome and many other issues. The more telling sign of cancer is if a person frequently alternates between constipation and diarrhea and if they also experience unintended weight loss, extreme fatigue, and blood in the stool.
When these symptoms occur together, they suggest cancer. Visiting a medical professional immediately is key.

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