Causes and Risk Factors for Undescended Testicle

The cause of undescended testicle is unknown. Having a father or brother who had the condition increases the risk. Other risk factors include the following:

  • Low birth weight (less than 2500 g)
  • Maternal exposure to estrogen during the first trimester
  • Multiple birth (e.g., twin, triplet)
  • Premature birth (before 37 weeks gestation)
  • Small size for gestational age

Publication Review By: Stanley J. Swierzewski, III, M.D.

Published: 09 Jun 1998

Last Modified: 13 Oct 2015