How does urethral orifice enlarge to do

Normal male urethral orifice is located in the most front end of the penis, generally longitudinal line shape, diameter is 5-7 mm, greater than 7 mm, it is called urethral orifice expansion, less than 5 mm called urethral orifice stricture. Large 7 mm called urethral orifice expansion, urethral orifice expansion Generally speaking, there is no big impact on urination, but urethral orifice less than 5 mm, may cause urination time extension, urine line thinning, urination effort and difficulty. Show above these circumstances are generally need to come to hospital, necessary when the need to do urethral external mouth expansion treatment.