A member asked:

What are common early symptoms of colorectal cancer?

4 doctors weighed in across 2 answers

Often "silent": Unfortunately, colon cancers may develop "under the radar" for quite some time before symptoms occur. The earliest sign is usually anemia caused by a slowly bleeding tumor. As the cancer grows, it may block the colon causing cramping pain, bloating, and/or pencil-thin stools. The gold standard for diagnosing colorectal cancer is screening colonoscopy at age 50, or earlier with a family history.

Answered 3/4/2014

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Colorectal cancer: There are classic symptoms of decreased caliber of stool and constipation or change in bowel habits. But it can also present as a rectal bleed and weight loss.

Answered 9/28/2016

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