<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some trouble with urination lately. I have to go very frequently and sometimes I even urinate involuntarily.  <response>: Based on your symptoms, it seems that you may have developed a urethral stricture. This is a condition where the urethra narrows, making it difficult for urine to pass through and causing symptoms like excessive urination at night and involuntary urination. 