Also known as "lower consumptive thirst." The main symptoms include polyuria with urine resembling skin or fat, often accompanied by dysphoria, dry mouth with a desire to drink, a red tongue, and a deep, thin, and rapid pulse. This condition is caused by the deficiency of kidney yin and the inability to retain fluids. It is also related to the spleen's failure to transport and transform. If there is frequent urination, a dark complexion, impotence, and a deep, thin, and weak pulse, it indicates a deficiency of both yin and yang.