Motor neurone disease is a serious life-changing condition which causes progressive paralysis and premature death
It is extremely rare, affecting only five to seven people in every 100,000 in the UK. In the US, it is known as amyotrophic lateral sclerosis or Lou Gehrig's Disease named after a baseball player who developed the disease. Its causes are not well understood.
In 2003, research was published in the US linking the condition to military service in the Gulf.
Researchers at the University of Glasgow looked at 57,000 veterans in Scotland who were born between 1945 and 1985 and who had a wide range of experience and lengths of service in the Armed Forces over a 50-year period.
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Their results were similar to the 2005 US study, they found a 50 per cent increased risk after military service, compared with people who had never served, but there was no link to any operational deployment and the risk did not worsen with longer service.
"Because the cases occurred over such a long period of time, we are confident that there is no specific link to Gulf War service, although higher rates of military smoking may explain the increased risk. This is a very rare disease and veterans should not worry unduly," Bergman said.