My usual vocal range is F2-A4. During a recent illness, my range was temporarily reduced to F2-C4. Why does throat irritation seem to affect only my high notes?
Probably due to thickening of the vocal chords due to swelling. I've often found that when I get a throat problem, my range is lower. I can't hit my highest notes and can hit lower notes than usual. (I'm a rather high baritone, by the way; I've sung lead in a barbershop quartet and second tenor in a choir.)