Iron deficiency simply means that the iron levels in your body are low. You can have low iron without being anaemic. Iron deficiency typically leads to iron deficiency anaemia. Iron deficiency is when the body’s liver stores of iron begin to become depleted whilst iron deficiency anaemic is when numbers of red blood cells are reduced, or the amount of normal haemoglobin in the blood is reduced. So anaemia is the end stage of having low iron where there is a reduction in red blood cells or haemoglobin. Iron is essential for normal body function and to make haemoglobin.