I have read the previous posts on bubbles running through the calves or legs, and 90 % of the answers say it is RLS. I have this, and it is something totally different. It almost feels something is running through the veins, like bubbles. Some of the posts people will ask about blood clots and such, which I also was concerned about. It does run on my left leg ( backside) where I do have vericos veins( sp). Generally it is felt from sitting positions and when in bed. It does not really hurt, it s more like pressure running through the blood in the leg. It is different than muscle aches. It sometimes will run up through the upper leg (back side) It can be like a creepy crawly feel, yet not like in RLS. Seeking answers on line if you can help. Thanks!