Drinking water makes me want to pee. What's going on?

After drinking water in about 20 minutes will show want to urinate, this is a normal phenomenon, because after the human body intake a lot of water, then the kidney will absorb into urine, and then excreted, then can produce a lot of harmful substances, and then with urine excretion, then drink water after showing want to urinate, this is normal. However, if the patient shows that he wants to frequent urination, it may be an abnormal situation, which may be caused by the infection of the patient's secretion and urine system. At this time, it is necessary to seek medical examination from time to time, and then treat it under the guidance of a doctor.