A major risk factor for the development of testis<unk>  is cryptorchidism (undescended testicles). It is generally believed that the presence of a tumor contributes to cryptorchidism; when cryptorchidism occurs in conjunction with a tumor then the tumor tends to be large. Other risk factors include inguinal hernias, Klinefelter syndrome, and mumps orchitis. Physical activity is associated with decreased risk and sedentary lifestyle is associated with increased risk. Early onset of male characteristics is associated with increased risk. These may reflect endogenous or environmental hormones. Higher rates of<unk>  in Western nations have been linked to the use of cannabis.
Testicular cancer
Epididymitis
Testicular torsion
Spermatocele
Inguinal hernia
Appendix of testis
Hydrocele testis
Hydrocele