Hi doctors, can you tell me what is iron deficiency anemia?

Lack of iron. Generally speaking, anemia represents a decrease in the number of red blood cells and hemoglobin. Iron deficiency anemia is a type of anemia caused by insufficient iron available in the body due to various reasons including insufficient intake, impaired absorption, decreased utilization in the bone marrow, chronic blood loss (example: heavy menses).
Lack of Iron. Iron deficiency anemia is result of insufficient iron supply and/or chronic blood loss. Our red blood cells are produced in bone marrow, which needs iron to build functional hemoglobin. Hemoglobin is a protein, that contains iron, which in turn binds oxygen in lungs to carry it to tissue. Insufficient iron supply usually result from vegetarian diet or poor iron absorption. Gi is gu loose blood.