Kidney deficiency is proved by syndrome differentiation of traditional Chinese medicine, which can't be detected by instruments. If kidney deficiency is confirmed, it should be treated as kidney yang deficiency and kidney yin deficiency. The symptoms of kidney-yang deficiency are backache, chills in limbs, chills and even edema, which means "cold". Poor sexual function can also lead to kidney yang deficiency; The symptoms of kidney yin deficiency are "heat", mainly including backache, dryness and heat, night sweats, sweating, dizziness and tinnitus.