Anaemia is a lack of sufficient red blood cells. However, in fact it is shortage of haemoglobin, the oxygen-carrying pigment of red blood cells (Male Hb < 13 g/dl; Female; Hb < 11 g/dl). The effects of anemia are due to shortage of oxygen throughout the body.
A person from any age group can suffer from anemia.  Females in their reproductive age are generally prone to anaemia due to loss of blood (iron) during menstruation.

Patients who become anaemic slowly may be asymptomatic for a long time. 

Most common form of anaemia is Iron deficiency anaemia.
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