This is the second or third episode I have had (separated by several months) where my right arm only becomes swollen and the veins bulge in my arm and hand. There is also a tightness / pressure feeling in my shoulder. What is this about? Lyme / autoimmune related swelling or could it be deep vein thrombosis? Just wondering if anyone else has had this symptom of one-side-only swelling. The last thing I want to do right now is go to the ER and be treated like a guinea pig for a few hours...