The bladder is responsible for storing and excreting urine. As previously discussed, the lungs, spleen and kidneys all have roles in fluid metabolism and regulating the water distribution in the body. The "turbid' water collected by the kidneys that cannot be reused by the body is sent to the bladder for excretion as urine. TCM describes this function as "vaporization" of urine in the bladder. Disharmony of the bladder can lead to urinary problems such as incontinence or difficult urination. Kidney function complements bladder function so a problem with the bladder often indicates kidney problems as well.