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Signs and symptoms of Klinefelter syndrome in men, boys, teenagers and babies

Klinefelter syndrome is a genetic condition that results when a boy is born with an extra copy of the X chromosome. Klinefelter syndrome is a genetic condition affecting males, and it often isn't diagnosed until adulthood.

Klinefelter syndrome may adversely affect testicular growth, resulting in smaller than normal testicles, which can lead to lower production of testosterone. The syndrome may also cause reduced muscle mass, reduced body and facial hair, and enlarged breast tissue. The effects of Klinefelter syndrome vary, and not everyone has the same signs and symptoms.

According to Mayoclinic, most men with Klinefelter syndrome produce little or no sperm, but assisted reproductive procedures may make it possible for some men with Klinefelter syndrome to father children.


Signs and symptoms of Klinefelter syndrome vary widely among males with the disorder. Many boys with Klinefelter syndrome show few or only mild signs. The condition may go undiagnosed until adulthood or it may never be diagnosed. For others, the condition has a noticeable effect on growth or appearance.

Signs and symptoms of Klinefelter syndrome also vary by age.


Signs and symptoms may include:

1. Low sperm count or no sperm

2. Small testicles and genital

3. Low love making drive

4. Taller than average height

5. Weak bones

6. Decreased facial and body hair

7. Less muscular compared with other men

8. Enlarged breast tissue

9. Increased belly fat.

Boys and teenagers

Signs and symptoms may include:

1. Taller than average stature

2. Longer legs, shorter torso and broader hips compared with other boys

3. Absent, delayed or incomplete puberty

4. After puberty, less muscle and less facial and body hair compared with other teens

5. Small, firm testicles

6. Small genital

7. Enlarged breast tissue (gynecomastia)

8. Weak bones

9. Low energy levels

10. Tendency to be shy and sensitive

11. Difficulty expressing thoughts and feelings or socializing

12. Problems with reading, writing, spelling or math.


Signs and symptoms may include:

1. Weak muscles

2. Slow motor development, taking longer than average to sit up, crawl and walk

3. Delay in speaking

4. Problems at birth, such as testicles that haven't descended into the scrotum.

Content created and supplied by: Kwajaffa (via Opera News )

Klinefelter Mayoclinic


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