Iron deficiency anemia is a common type of anemia. It is a condition in which the blood lacks healthy red blood cells that can carry oxygen to the body's tissues. As the name suggests, iron deficiency anemia is caused by not having enough iron. Without enough iron, the body cannot produce hemoglobin to carry oxygen.

The authors recommend colonoscopy and fecal occult blood testing as the primary screening modality for colorectal cancer screening. In addition, they also offer other screening tests when patients cannot perform the two options above.

Colon cancer is a common disease with a higher incidence in men than women. The disease usually appears between the ages of 40-45, and tends to increase with age. The disease has unclear signs, so the accurate diagnosis of colon cancer must rely on laboratory measures.