What Are Symptoms of Malignant Neoplasms in the Colon?

Symptoms of malignant neoplasms in the colon include red or very dark blood in the stool, a change in bowel habits, unexplained weight loss, frequent gas pains and stools that are unusually narrow, according to the National Cancer Institute. Other symptoms of the cancer include fatigue, vomiting and diarrhea.

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