<unk>  is the underlying cause for 1–5% of male infertility. Since<unk>  is a relatively rare cause of infertility, this possibility may be unfamiliar to some physicians, even some urologists.
Ejaculatory duct obstruction
Penile torsion
Prostate hypoplasia
Male accessory gland infection
Testicular trauma
Müllerian agenesis
Urethral caruncle
Fallopian tube obstruction