'Invisible illness' affects millions of women worldwide - often without them realising
!['Invisible illness' affects millions of women worldwide - often without them realising](https://i2-prod.mirror.co.uk/incoming/article33159285.ece/ALTERNATES/s615/0_GettyImages-1389292117.jpg)
Despite millions having the condition, few know about what the signs and symptoms mean and how to treat it
Despite millions having the condition, few know about what the signs and symptoms mean and how to treat it