When I get sick or allergies it always seems as if I hurt so much worse. Since getting RSD it seems as if I get sick alot more than I use to. I have read somewhere that RSD affects your immune system. Can't remember where. But if it affects it then I guess it would make sense that colds and sickness would make it flare. If there connected like that. Your not alone. I guess if its wierd than we can be wierd together. LOL Hope your feeling good today. Best Wishes!