By: Joseph Hernandez

In a number of situations colon cancers bleed. Under some circumstances, the blood may be visible in the stool. When the cancer is in the vicinity of the rectum, the blood could even surface as bright red. Even though the blood cannot be seen, the bleeding may still be detectible in other ways. As an example, the loss of blood might manifest as anemia. Blood tests might disclose internal blood loss that could be from a tumor in the colon. The main blood test results to check are the hemoglobin, hematocrit, and Mean Corpuscular Volume (MCV) levels. Levels below the normal range may suggest blood loss and iron deficiency anemia. When a patient presents with levels that are low for these tests physicians generally acknowledge that there ought to be follow up to find out the explanation for the blood loss, including the chance of cancer of the colon.

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