Why did I get fibro and not everyone else?

What causes fibromyalgia? No one really seems to know. We do know what triggers it – stress, a viral or bacterial infection, traumas such as a death in the family or an automobile accident. Why these events trigger fibro in some people but not in others is not yet fully understood. One theory is that we are genetically predisposed to develop it, because of some other physical abnormality.