Why do you always want to go to the bathroom but not much urine?

Always want to go to the toilet, but the urine volume is not much of the following reasons: First, urinary system infection, such as urethritis, cystitis will cause urethral mucosa to show edema and congestion, so that the sensitivity of urethral mucosa increased, it will show frequent micturition, but also accompanied by urgency, urinary pain and other performance; Second, bladder overactivity disease. Patients will also show urgency, urinary pain symptoms, in the urine routine examination when there is no abnormality, need to carry out urodynamic examination /confirm/ied; Third, urinary tract stones, such as ureteral stones, bladder stones, etc., can also cause frequent urination, need to go to the hospital to do a detailed urinary system B-ultrasound diagnosis.