Kidney yin deficiency and kidney yang deficiency can occur at the same time, showing symptoms of kidney yin and yang deficiency. Kidney deficiency is often characterized by kidney yin deficiency and kidney yang deficiency. However, when kidney yin deficiency develops to a certain extent, yin damage and yang damage can be accompanied by kidney yang deficiency; kidney yang deficiency and yin damage over time can also be accompanied by kidney yin deficiency, resulting in kidney yin and yang deficiencies. The symptoms of kidney yin and yang deficiencies include lumbar and knee soreness and weakness (a feeling of soreness and weakness in the lumbar and knee areas), and symptoms of yin deficiencies such as hot hands and feet (irritability and sultriness), night sweating (abnormal sweating after going to sleep, but sweating stops after waking up), and symptoms of yang deficiencies such as coldness (fear of cold), and long and clear urination. In addition to yin and yang deficiencies, kidney deficiency can also be seen in qi deficiency, kidney essence deficiency, etc. Yin and yang deficiencies can develop to a certain extent, but also yin and yang deficiencies can also occur, the specific should be combined with the clinical symptoms of comprehensive diagnosis and analysis.