Just started working out this past week. Two days ago I was doing incline curls. I wasn't reallys sore at all yesterday, but this morning I woke up with a terrible pain in my left bicep, right where it connects to the "inside" of the elbow. It's perfectly fine from 0-150 degrees, but when I try to stretch it straight out it feels like it's pulling and it hurts quite a bit. Is this something I should be worried about, or is it simply muscle soreness? I haven't worked out in a long time so I don't know if this is normal or not. I don't know if DOMS is very widely used, but it's a term that was used a lot in my physical well being class. Delayed Onset of Muscle Soreness.