There are five main causes of kidney yang deficiency: 1. Body yang deficiency refers to the imbalance of yin and yang in the human body due to congenital or acquired factors, affecting the kidneys, leading to yang deficiency. 2. Kidney deficiency in old age and kidney yang deficiency. The youthfulness of the kidneys determines the youthfulness of the human body. On the contrary, as the human body ages, the human kidneys also begin to weaken. 3. Prolonged illness damages the kidneys. Any disease that develops to a severe stage can involve the kidneys, leading to kidney yang deficiency and decline. Therefore, kidney diseases are mostly deficiency syndromes. 4. Excessive sexual intercourse and excessive sexual intercourse, such as too frequent intercourse, early marriage, masturbation, etc. Excessive sexual intercourse can damage the kidney yang. 5. People who are overly afraid of kidney damage have different emotional activities that correspond to the five internal organs. For example, when the heart is in the will, it is happiness, when the liver is in the will, it is anger, when the spleen is in the will, it is thinking, when the lungs are in the will, it is worry, and when the kidneys are in the will, it is fear. . Therefore, excessive fear can cause kidney qi to become unstable.