The five elements corresponding to the kidneys are water. The five elements refer to wood, fire, earth, gold and water, and the corresponding internal organs are liver is wood, heart is fire, spleen is earth, lung is gold and kidney is water. The five elements are widely used in traditional Chinese medicine, and can be used in the diagnosis and treatment of diseases. Chinese medicine believes that the kidney is the innate nature of the five elements of water, the kidney is also known as the water organ. Kidney contains kidney yang and kidney yin, kidney yin is also known as kidney water, kidney yang is also known as kidney fire. Therefore, the kidney is also known as the organ of water and fire. The five elements of the Kidneys are water, and the Kidneys dominate water meaning that the Kidneys are able to preside over and regulate the metabolism of water and fluids in the human body. Traditional Chinese Medicine (TCM) can use the interconnectedness of the five elements and the five organs, and the relationship between them to diagnose and treat physical illnesses.