The most common symptom is infertility. Other symptoms include abnormal body proportions (long legs, short trunk, shoulder equal to hip size), less than normal amount of pubic armpit and facial hair, small, firm testicles, reduced muscle and tall stature. Breast development may appear after puberty in 25 per cent of those affected. In some cases, intellectual difficulties, especially in verbal skills, may be experienced. Additionally psychological problems with self-image may be experienced by adolescent boys and adult men.
Other chromosome abnormalities involving more than two X chromosomes in males may lead to more severe learning difficulties.