In Chinese medicine, blood deficiency is a condition that underlies many illnesses. In Western medicine it may be diagnosed as anaemia. The heart has to beat much harder to supply the body with oxygen if the person is anaemic. Up to 40% of women will be anaemic during their lifetimes, (men only reach 26%). This high risk in women can occur during childhood, menstruation, pregnancy and old age. Extreme exhaustion is one of the first signs and should be checked out if it does not resolve quickly.