Urinary bifurcation is caused by temporary partial obstruction of anterior urethra or urethral orifice. For example, the morning urination bifurcation is due to the urine accumulated in the bladder overnight, the pressure in the bladder is high, and the impact force when the urine is discharged is also great, which temporarily changes the shape of the urethral orifice. Sometimes in after ejaculation, because part of semen remains in the urethra, and the congestion of the corpus cavernosum has not completely disappeared, it will also lead to dysuria and bifurcation of urination.