Chapter 18 – Male Sexual Dysfunction, Prostate Disease and Testicular Lumps

Testosterone or androgen deficiency

Testosterone is the most important androgen (male sex hormone) in men and is secreted in a circadian rhythm. It is important for libido, as well as conferring many other health benefits. In men, 95 per cent of testosterone is produced in the testes and 5 per cent from the adrenal glands. Women have a much lower level of testosterone, with 50 per cent produced in the ovaries and 50 per cent in the adrenal glands. (1)

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The role of testosterone

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Androgen deficiency

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Specific symptoms with low testosterone

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Causes of low testosterone or hypogonadism

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Examination

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Investigations

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The connection between testosterone, sexual function and depression

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The connection between testosterone and obesity

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The controversy of late onset hypogonadism (LOH) also known as partial androgen deficiency of the ageing male (PADAM)

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Diagnosis of hypogonadism allowing authority prescription

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Testosterone replacement therapy treatments

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