My neck is still hard 5 years out. The fact is all those fatty tissues had to go with the neck dissection, and the body is disinclined to put more back there. If you have been hoarse since treatment and this is not something new, this could be nothing more than scar tissue on your larynx, also a problem that I had for an extended period after radiation. Survivorship is synonymous with vigilance. It never hurts to have an educated eye check you out.