Evaluate. Microcytic anemia can be caused from iron deficiency, thalessemia, chronic disease, or sideroblastic anemia, so the first thing is to determine the cause of the anemia.
Small cells. Microcytic red blood cells are small rbcs - usually caused by low iron from decreased iron stores or blood loss.
Small red blood cell. Small rbcs can be seen in iron deficiency. It is also seen in thalassemia, a common disorder of red blood cells. Thalassemia is common in families from the mediterranean or south east asian countries. There are other less common causes.