Physical characteristics of Klinefelter syndrome

Low testosterone is the reason for many issues in KS.  The features vary widely between individuals with KS and many individuals with KS are diagnosed as adults because of infertility and have few of the physical features.

  • Tall stature
  • Longer legs
  • Shorter torso
  • Broader hips
  • Reduced facial and body hair
  • Reduced muscle mass
  • Absent, delayed or incomplete puberty
  • Weak bones
  • Hypogonadism (reduced or absence of hormone secretion of the testes)
  • Fertility problems
  • Increased risk diabetes and /or hypothyroidism
  • Dental problems
  • Scoliosis
  • Swelling of breast tissue during puberty
  • Cognitive, reading, and language difficulties
  • Depression and/or social differences
  • Adults with KS have increased risk of breast cancer and systemic lupus