When I touch the lowest string string to make palm mute or just muting it (basically all the time) I always feel a slight tense on my shoulder of the picking hand.
I could play like that for hours, but once in a while I have to stop for half a minute, because it grows gradually.
Does everyone feel that tension when doing that?? Or am I grabbing wrong my guitar??
Do you push excessively hard when you palm mute? Feeling your shoulder tense up like that isn't necessarily normal, so it's probably a technique issue.