There's hope for millions of men as scientists show no link between testosterone treatment and prostate cancer, Emily Dugan reports.
The "male menopause" has been ridiculed as an excuse for men behaving badly in middle age, but the condition is a real one. Now more than two million sufferers have been given hope of a safe cure.
For years, testosterone replacement treatment (TRT) - the most effective known medication for what is officially the andropause - had been linked to prostate cancer. But today clinicians will announce that research has found no link, meaning that for the first time doctors will be able to recommend the treatment without fear.
The 15-year study of 1500 patients by the Institute of Urology at University College Hospital, London, disproved the link and found that raising testosterone levels could in fact be beneficial to the prostate.
The condition, also known as testosterone deficiency syndrome, causes sufferers - predominantly men aged 50 or over - to experience extreme tiredness, depression, weight gain, brain fog, memory loss, sleep disturbance or lower sex drive. Erectile dysfunction can also be a symptom, although for many the only obvious symptom is fatigue.