Doctors reveal first warning sign of Parkinson's... and it's not one of the three tell-tale symptoms - Daily Mail

Parkinson's is caused by a loss of nerve cells in an area of the brain responsible for producing dopamine, which helps co-ordinate body movement.

Rytis Maskeliūnas, a data scientist at Kaunas University of Technology, said: 'Changes in speech often occur even earlier than motor function disorders.'

The National Institute for Health and Care Excellence (NICE) is recommending eptinezumab for around 164,000 adults where at least three previous preventive treatments have failed

'We are not creating a substitute for a routine examination of the patient – our method is designed to facilitate early diagnosis of the disease and to track the effectiveness of treatment,' the professor said.

Professor Maskeliūnas (pictured) said the link between Parkinson's and speech abnormalities has been clear since the 1960s, but technological advances have made it easier to analyse

It causes muscle stiffness, slowness of movement, tremors, sleep disturbance, chronic fatigue, an impaired quality of life and can lead to severe disability.