In conversations about CFS, the one question I am asked the most is, "What's causing My [their] chronic depression and fatigue?" Followed by, "Is it just stress?"
I'll admit I am not a doctor and have no medical training, however, I have done a fair bit of research over the last decade and I am a real CFS Survivor. That said, it is my belief there are three fundamental 'Camps' if you will, that can cause depression or fatigue and it is absolutely essential to determine what camp you are in to expedite speedy recovery.
Camp #1: CFIDS [Chronic Fatigue Immune Dysfunction Syndrome]
CFIDS is the new acronym for most immune dysfunctional disorders which covers a broad base of causes and outcomes. More specifically, the factors that can bring on CFS are viral. In my case I was diagnosed with the Epstein-Barr Virus [EBV]. Another common virus known to cause CFS is the ME Virus [Myalgic Encephalomyelitis]. An outcome associated with CFS sufferers is Fibromyalgia; an excruciatingly painful disease that effects all the muscles and joints in the body.
I could go on but the important point to understand is that most of what causes 'Real' Chronic Fatigue Syndrome is most often viral. These viruses attack the immune system causing acute un-wellness, fatigue and depression. Stress is another immune-weakening phenomenon and is often a major cause for CFS. On the other hand, motivators like post viral infection - as it was in my case - is known to be much of the cause because of the damaging consequences it can affect to an otherwise healthy immune system. One outcome is Depression and Fatigue.