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Avoid drinking much water, not more than 2 litres a day. There could be a mild urinary infection which can cause this problem. Also get your electrolytes tested to look for Diabetes insipidus
which can cause excess urination. Do your kidney function tests as well. Prostatitis
will cause pain if digital rectal examination
is done. Your Urologist
will guide you to the diagnosis and management. Avoid high salt diet.