When you drink more fluids to satisfy your thirst, you usually will need to urinate more often. This is normal.
When you are urinating more frequently and drinking more fluids for no apparent reason, a disease such as diabetes may be the cause. Symptoms of diabetes include increased thirst and frequent urination (especially at night), unexplained increase in appetite, unexplained weight loss, fatigue, erection problems, blurred vision, and tingling or numbness in the hands or feet.
Other medical conditions can also cause increased urination. Call your health professional if you have a new problem with increased urination.
WebMD Medical Reference from Healthwise