Kidney deficiency is mainly manifested as premature senility, forgetfulness, weakness of waist and knees, fatigue, decreased sexual function and bad mood. Kidney deficiency, also known as "kidney deficiency", is a general term for kidney yang deficiency, kidney yin deficiency, kidney qi deficiency and kidney essence deficiency, which is mostly related to congenital deficiency, chronic illness, excessive sexual intercourse, overwork, physical weakness in old age and mental factors. The manifestations of kidney deficiency involve nervous system, mental system, urinary system, reproductive system, digestive system, endocrine and metabolic system, blood and respiratory system. Mainly manifested as weakness in the waist and knees, decreased sexual function, fatigue, premature aging, forgetfulness and bad mood. The clinical manifestations of different syndromes have their own characteristics. Diseases caused by kidney deficiency range from low resistance to colds, to various cancer diseases and even life-threatening. Therefore, if you feel unwell, you should go to the hospital in time.