小细胞低色素性贫血最主要的原因是铁缺乏。最常见的营养缺乏是膳食中铁的不足。因此缺铁性贫血就较为常见。儿童和生育期妇女（从月经失血和妊娠期）是最危险人群。
The most common cause for a hypochromic microcytic anemia is iron deficiency. The most common nutritional deficiency is lack of dietary iron. Thus, iron deficiency anemia is common. Persons most at risk are children and women in reproductive years (from menstrual blood loss and from pregnancy).
