“There is no specific test for multiple sclerosis.  Its early symptoms - fatigue, loss of sensation, weakness and visual changes - are frequently misdiagnosed as psychoneurosis or an even more severe psychiatric disorder, such as hysteria, particularly in women.
When doctors could find no organic cause for [Jacqueline Du Pré's] complaints, they prescribed a year's rest, and referred her to a psychiatrist... When she consulted a doctor in Australia about her tenacious fatigue and occasional double vision in her right eye, he dismissed her symptoms as "adolescent trauma" and suggested she take up a relaxing hobby.”