Boys penis slanting to the left may be caused by penile torsion, tight foreskin tie and penile hardness, etc. The causes are different, and the treatments are different, generally can be treated by surgery. 1. Penile torsion: the head of the penis deviates from the midline and twists to the left, there may be penile torsion, simple penile torsion generally does not require surgical treatment, accompanied by painful erection or hypospadias, corrective surgery is feasible. 2. The foreskin tie is too tight: some men’s foreskin tie is congenitally short, which may cause the penis to be tilted to the left, affecting the husband and wife’s relationship disharmony, especially during erection, there may be slight pain. If it has affected the normal life, it can be treated by surgery for tethering loosening, consulting the specialized doctor for the specific surgery. 3. Penile hardening: It may be related to penile trauma, genetic factors, and medical factors. In severe cases, the penis will be tilted to the left or right, and in severe cases, it will cause sexual dysfunction. If necessary, surgical treatment should be considered, such as penile tunica albuginea shortening or penile tunica albuginea lengthening. Boys penis tilted to the left, it is recommended to go to the hospital, clear cause for targeted treatment.