What causes male testosterone deficiency?

Testosterone deficiency results from failure or disruption of the body’s normal process of production or uptake of the hormone. This can be due to any or a combination of:

These failures or disruptions can in turn be due to a variety of causes, including:

How common is testosterone deficiency syndrome?

Estimates vary widely but our research at the Centre indicates that 20% of men (2 million) across the UK over the age of 50 suffer from testosterone deficiency syndrome. However, only 1% have been diagnosed and are being treated. It is natural for testosterone levels to fall gradually with age. 

How is testosterone deficiency diagnosed at the Centre?