One of the least known causes of hair loss is low iron. You do not have to be anemic to lose your hair. Your doctor may advise you that your iron levels are normal, but we know that low normal levels of iron will cause huge hair loss. We see this in women after childbirth and in women during the perimenopausal years when heavy periods may occur. Simply being a woman of childbearing age automatically puts you at risk of low iron. Up to 60 percent of women have low iron and it is often undiagnosed. Due to higher iron requirements as a result of menstruation, women need 20 milligrams of elemental iron daily yet most of us are only getting 8 mg per day from our diet. Now that we are not eating as much red meat, even postmenopausal women and seniors are suffering from low iron.