High prevalence of low iron counts
Over 30 % of all fertile women worldwide (even higher prevalence among teenagers and in the developing countries), especially those with menstruation for more than three days, have a latent anemia with increased uptake of cadmium instead of iron.
Iron deficiency is the most common explanation for anemia in women of childbearing age, but the causes vary.
Blood loss and pregnancy or lack of meat in the diet are the leading causes of iron deficiency in women. Other more rare reasons include problems of absorption (acquired or inherited), nutritional deficiencies (iron, Vitamin B12, folate, zinc); or disease (fibroids, cancer, inherited anemias or bleeding disorders)