Why do I get muscle spasms in my arm?

Question

It starts in a small area on my arm and you can see it like its pumping blood really hard

Answer 1

I'm not sure, but it sounds like you're talking about a twitch. I used to get them on my arm, eyelid, cheek, thigh, etc. They happen more often when I'm stressed, and they go away more easily when I get enough B vitamins. A twitch is like a small muscle or part of a muscle is flexing for a second, or perhaps several times in a row.