Kidney deficiency refers to the deficiency of kidney essence and yin and yang. There are many types of kidney deficiency, the most common of which are kidney yin deficiency and kidney yang deficiency. Symptoms of kidney deficiency: Symptoms of kidney yang deficiency are backache, cold limbs, chills, and even edema, which are symptoms of "cold". Poor sexual function can also lead to kidney yang deficiency; symptoms of kidney yin deficiency are "heat", mainly backache, dryness, night sweats, sweating, dizziness, tinnitus, etc. Modern science has proved that when a person has kidney deficiency, whether it is kidney yin deficiency or kidney yang deficiency, it will lead to a decrease in the person's immune ability. There is more evidence that when kidney deficiency occurs, the kidney's immune ability is reduced, and the kidney's microcirculation system will also be blocked, and the kidney network will be blocked. Therefore, the treatment of kidney deficiency should be combined with prevention and treatment.