Is it normal for certain blood vessels or muscles to randomly move rapidly?
Every so often I'll just be sitting/laying down, nothing special, when suddenly a spot on my body (usually in my leg or abdomen) just starts doing a sort of slow vibrating. It'll go really fast one moment, then stop, then start up and go even faster, then stop. I can actually see it happening if it's on my leg, it bumps up and down rapidly and i have no control over it. I'm not sure if it's muscle spasms or some sort of blood vessel doing something. Anyone know what this is?