Frequent urination and painful urination for three days, but the urine routine is normal, the main consideration is related to overactive bladder, urinary polyps, non-bacterial prostatitis and other diseases. 1. overactive bladder: its etiology is not clear, but is not caused by bacterial infection, can lead to frequent urination, urinary urgency and other symptoms, some patients in the urgency of urination, can also be accompanied by symptoms of urinary pain. In this case, the phenomenon of normal urine routine can occur. 2. Urinary polyps: patients may not have any symptoms, but may also show urinary difficulties, urinary frequency, urinary pain and other symptoms. In this case, the urine routine examination, may also appear to be no abnormality. With the development of the disease, there may be symptoms such as blood dripping after urination, which can be detected through routine urinalysis. 3. Non-bacterial prostatitis: this disease can also lead to patients with urinary pain, frequent urination and other symptoms. It is difficult to diagnose this disease due to the routine nature of urine tests. If you are experiencing these symptoms, it is recommended that you communicate with your doctor and under his or her guidance, undergo further tests to determine the cause of the disease and provide targeted treatment.