Also, what would you say is the impact on a person that has both at a severe level?
Interesting that the stats are so varied. You say that they are both functional disorders? Does that mean they don't have a dependency, nor do they cause each other, but can exist entirely independent?
Hi, though the exact cause is unknown it has been found that there is a link between fibromyalgia and IBS. Both are functional disorders. In one study, 32% of people with IBS also had fibromyalgia symptoms compared with 4% of people without IBS. Another study showed fibromyalgia occurring in 20% of people with IBS. And studies have estimated 32% to 70% of people with fibromyalgia also meet criteria for IBS. Regards.