Blood asthenia refers to insufficiency of blood and malnutrition of the viscera, meridian and body, with pale or sallow complexion, light-coloured lips and nails, dizziness, palpitation, insomnia, numbness of hands and feet, light-coloured and scanty menstruation delayed ，menstruation or amenorrhea weak pulse are common symptoms. Insufficient qi and blood will lead to the decline of the function of the viscera and cause premature aging. Moreover, qi and blood affect each other.Qi deficiency leads to less blood, less blood leads to qi deficiency.Long illness hurts Qi and consumes blood, resulting in a double loss of Qi and blood.
血虚则指血液亏虚，脏腑、经络、形体失养，以面色淡白或萎黄、唇舌爪甲色淡、头晕眼花、失眠多梦、健忘心悸、手足发麻，妇女月经量少、色淡、后期或经闭，脉细等为常见证候。气血不足会导致脏腑功能的减退，引起早衰。而且气血相互影响，气虚则血少、血少则气虚，久病伤气耗血，而致气血双亏。
