Kidney water deficiency refers to the deficiency of kidney essence, which can be seen in children as fontanel retreat, short stature, etc.; and in adults as hair loss, loose teeth, etc. Kidney essence deficiency refers to a series of symptoms triggered by the lack of kidney essence, mostly related to poor natural constitution, prolonged illness, and too much intercourse. This syndrome is characterized by developmental delay, hypogonadism and premature aging. Kidney essence deficiency in children can be seen in developmental delay mainly manifested as fontanel delayed closure, short stature, mental retardation, bone impotence, slow movement, etc.; adults manifested as men’s sperm less sterility, women’s menstruation less menstruation, hypogonadism, sexual function. Adult premature aging mainly manifests as hair loss, loose teeth, tinnitus and deafness, lumbar and knee soreness (the feeling of soreness and weakness in the waist and knees), dullness of spirit, forgetfulness, etc.. The tongue is thin and the pulse is thin and weak. Patients are advised to seek timely medical treatment under the guidance of a doctor.