Drinking water half an hour after wanting to urinate to consider physiological causes and pathological causes such as urinary tract infection, urinary tract stones, uremia and other causes. 1. Physiological factors: after drinking a lot of water, the volume of urine will increase, the number of urination will also increase, manifested as frequent urination, which is a normal phenomenon, do not need to worry too much. 2. Pathologic factors: (1) If the patient suffers from urethritis, cystitis, prostatitis and other infections of the genitourinary system, it can lead to frequent urination, painful urination, urinary urgency and other symptoms. (2) If the patient is combined with uremia, diabetes mellitus and other diseases, which are manifested in daily life such as drinking a lot of water, increasing the frequency of urination, and urinating a lot, the primary disease needs to be treated in time. (3) If the patient combines with diseases such as bladder stones, urethral caruncle, bladder foreign body, bladder tumor, etc., these diseases can stimulate the urinary tract, resulting in the desire to urinate immediately after drinking water. (4) If the patient has a small bladder capacity or combines with diseases such as bladder tuberculosis or overactive bladder, it can also lead to the urge to urinate soon after drinking water. There may be other reasons for wanting to urinate after drinking water for half an hour, and patients need to consult a doctor for timely examination and early treatment.