Hey all, When I read about chronic fatigue syndrome, post-exertional malaise almost always comes up as one of the defining symptoms of the disease. However, I don't believe I have ever had that. Mine was a sudden onset (last November), one night I went to bed fine and the next morning I woke up unbelievably exhausted, and it's only gotten worse from that day. However, I was still able to exercise vigorously when I first got sick, which did not worsen my fatigue, or improve it. Since then I have gotten progressively more fatigued, and I have not tried exercising for a while. But I do walk around frequently, and don't limit my physical activity. I have never experienced the post-exertional fatigue that I keep hearing about. If this is a hallmark symptom of CFS, then is it possible I don't have it? My doctors have ruled out everything else, so it seems that whatever is causing my chronic fatigue is different from others. Any thoughts?