The urethra is a tube that carries the urine from the bladder until its outlet at the tip of the penis during the micturition. The first portion of the urethra, just below the bladder neck, is surrounded by the prostate. When the prostate enlarges while ageing, the urethra became obstructed. In these cases, the patient has obstructive symptoms like a poor urinary stream, frequent and urgent urination. Moreover, the urethra can be infected (mainly because of STDs), become inflamed, causing urethritis. Chronic inflammation or trauma of the urethra causes urethral stricture. The urethra can be also the site of malignant tumours like the carcinoma of the urethra.