article_snippet: Around 400,000 people in the UK suffer the condition.
article_snippet: More than 90 per cent of these cases are in women.
article_snippet: the condition is commonly diagnosed around the age of 40.
article_snippet: There is a school of thought that believes the illness is inherited.
article_snippet: a school of thought that believes the illness is inherited is also thought to be linked to other conditions including irritiable bowel syndrome and fibromyalgia.
article_snippet: Source: NHS Choices . '
article_snippet: While it's more common in women over 40, it can affect younger women, too.