Klinefelter (XXY) syndrome
Klinefelter (XXY) syndrome symptoms includes small genitals and infertility. Around 1 in 500 males have Klinefelter syndrome, but most are unaware.
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Intersex variation
‘Intersex’ refers to physical, hormonal or chromosomal differences that don’t fit the typical male or female body. They occur in about 17 in every 1,000 live births (or 1.7%).
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Gynaecomastia
Find out about the treatments for gynaecomastia – the development of enlarged breasts in males - also sometimes called 'man boobs'.
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Testosterone
Your testosterone levels can vary depending on your sex, age and health. Learn more about low testosterone, possible causes and symptoms.
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Guide to genetic disorders
Problems with genes can cause health or development problems. Some genetic disorders affect people from birth, others develop later in life. Learn more from a trusted source.
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