How do i know if i have klinefelter syndrome?

Klinefelter syndrome: Klinefelter syndrome occurs only in men and is defined classically by a 47, XXY karyotype instead of the usual male sex complement (genotype xy). These males have enlarged breasts, sparse facial and body hair, small testes, an inability to produce sperm, some mental retardation and psycho-social problems. One has to be evaluated by both an endocrinologist and a geneticist.