Infertility in men with coeliac disease is associated with elevated testosterone and LH levels. In myotonic dystrophy, small testes may be associated with abnormalities of both spermatogenesis and Leydig cell function.
Spinal cord lesions associated with paraplegia lead to persistent defects in spermatogenesis and to temporary decreases in testosterone levels that tend to return to normal; some patients retain the capacity to obtain an erection and to ejaculate.
