Anaemia occurs when oxygen carrying capacity of blood is reduced. It accompanied by low hemoglobin in the blood and Iron deficiency is the most common cause of anemia. It occurs when the body doesn’t have enough of mineral iron. A poor diet or certain intestinal diseases that affect how the body absorbs iron cause iron deficiency anemia. In women of childbearing age, the most common cause of iron deficiency anemia is a loss of iron in the blood due to heavy menstruation or pregnancy. While the condition may be common, a lot of people don’t know they have iron deficiency anemia. It’s possible to experience the symptoms for years without ever knowing the cause.