u/WaferNo8742

I always do a proper warm up before leaving the house, but once I’m at the gig, my lips still start to feel thick or swollen, and my sound and endurance get worse even I did short warm up in the hall, Has anyone else experienced this? What could be causing it?

Is a neck guard necessary? I have one, but I only wear it when I play the trombone. I take it off before putting my trombone back in its case.