According to a study led by the University of Birmingham in Britain, Increased levels of hormone testosterone -- male sex hormone -- in women could cause a brain disorder that can lead to blindness. The study, showed that excess testosterone leads to Idiopathic Intracranial Hypertension  -- high pressure in the brain -- resulting in blindness and daily long-term headaches in women. 

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The  study’s findings showed that women with IIH had raised levels of testosterone compared to those with obesity and polycystic ovary syndrome (PCOS). The hormones were also found to be increased in the brain fluid of women with IIH. 

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Alex Sinclair, Researcher from the varsity said that these findings mark a key step forward. For the first time we have found a pattern of androgen dysregulation that is unique to IIH and potentially a driver of abnormal brain pressure in people with the condition. Sinclair further added, "Taken together this provides the first evidence that IIH may be a manifestation of female androgen excess,"

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Originally identified over 100 years ago, the cause of IIH has remained unknown yet, despite speculation about why more than 95 per cent of the total incidence is in women with obesity.