Kidney deficiency includes kidney yin deficiency, kidney yang deficiency, kidney qi deficiency and kidney essence deficiency. In Chinese medicine, the kidneys are called the “essence of the innate nature” and hold the body’s essence, so kidney deficiency is a deficiency of the essence hidden in the kidneys. There are several reasons for kidney deficiency: (1) congenital deficiency, parents are weak and sickly, lack of essence and blood leads to kidney deficiency in children; (2) indulgence in sexual intercourse, which is a very common cause; (3) emotional disorders, temperamental, emotional excitement or excessive depression can affect the normal function of the kidneys, leading to kidney deficiency; (4) chronic diseases that do not heal easily and quickly, long-standing illness, loss of (4) chronic diseases that do not heal easily and quickly, long-term depletion of essence, resulting in kidney deficiency; (5) old age and physical decline, the elderly kidney deficiency, easy to waist and knee weakness, joint pain, etc. The most common symptoms of kidney deficiency are sexual dysfunction, waist and leg pain, tinnitus and deafness, hair loss, dripping after urination, urinary incontinence, and even infertility. Patients with kidney deficiency should usually keep a happy mood, pay attention to sleep, do not stay up late, quit bad habits, exercise more, and can be assisted by dietary therapy, eating more black food, such as fungus, black beans, etc. If the symptoms do not ease in time, it is recommended to consult a doctor for early treatment.