Does a person with Klinefelter syndrome look different?
There are no characteristic facial features or major physical abnormalities associated with Klinefelter’s syndrome. During childhood, many boys with KS grow faster and have a tendency to be thin with poor muscle development. From the age of 7 there is a tendency to put on fat in about 75% of men with KS and so they are more likely to be overweight. Some men with Klinefelter’s syndrome may develop enlarged breasts. Sparse facial and body hair is also associated with this condition. Surgery can reduce breast size and regular injections of testosterone will increase strength and muscle size, and promote the growth of facial and body hair.
