Oh my, yes. Not limited to that muscle either. For me, it's more what I have always called the trapezius. If I look all the way to one side or the other, bang! It is not something you can fight through either. Once it cramps, you can't turn in that direction for a while or it does it again. For a while the muscle that attaches at the base of my skull would cramp and it rates as one of the most painful things I've experienced post-tx. If I can't make it stop it takes me to my knees.

I've been given a couple of possible causes the most likely of which is that those muscle were weakened by Tx and node removal surgery. Even though I did well in treatment and am very physically active, I carry my head differently to compensate for the weakness causing strain on muscles that are fairly small and not designed for that kind of stress. I try to pay more attention to my head posture with moderate success.