Klinefelter's Syndrome

Savannah Clark


this condition that occurs in men who have an extra X chromosome and can affect stages of physical, language and social development.


  • Boys may be taller than other boys their age, with more fat around the belly

After Puberty, KS boy may have

  • smaller testes and penis
  • breath growth
  • less facial and body hair
  • reduced muscle tone
  • narrower shoulders and wider hips
  • weaker bones
  • decreased sexual interest
  • lower energy

KS males may have learning or language problems.

They may be quiet and shy and have trouble fitting in.


A genetic test can diagnose KS. There is no cure, but treatments are available. It is important to start treatments as early as possible. With treatment, most boys grow up to have normal lives.

Treatments include, testosterone replacement therapy and breast reduction surgery. If needed, physical, speech, language, and occupational therapy, may also help.

Life Expectancy

Most men with Klinefelters syndrome can live a normal and productive life. Early diagnoses, educational interventions, medical management, and strong social support will help the males live full and productive life.

3 Important facts

1. XXY is one of the most common genetic conditions, affecting about 1 in 660 genetic males.

2. A karyotype test can be used to see if you have Klinefelter's.

3. Klinefelter syndrome is named for Dr. Harry Klinefelter, who first reported its symptoms in 1942.