Ok, been told cfs?me is caused by viral inf., does that mean soon after viral inf, or can it be from yrs ago?

Chronic fatigue synd: Herpes virus 8 has been implicated as a potential cause of cfs, but in many cases the diagnosis is quite difficult to accurately establish because the symptoms are often non-specific and could represent numerous other entities. Although generally accepted as an illness there are many professionals who thing many patients have a psychogenic condition. Lots we don't know.

Not always viral: The etiology to viral infection has been implied in some cases, but there are multiple reasons and viral is not definite in many. Other causes have been suggested from physical as well as mental. Each person needs to be evaluated individually. The similarity to fibromyalgia is important. Many with cfs have fibromyalgia.