To elaborate a little more with John...There are little hairs in your ear, when they are excited by sound they vibrate, which tranfers that vibration into nerve impulses, that your brain interpets as sound. When the hairs are subjected to constant loud noises, they will vibrate after the sound stops; that's where the ringing comes from. Generally, those hairs when pushed to ringing will fall out gradually over a long period of time. They do not grow back. Hearing loss from loud noise is permanent.
Generally, a concert or two won't do anything, or even cranking up the car stereo from time to time.
But...if you work in a noisy environment, or are subjected to a high level of white noise on a day to day basis, concerts and loud events are really bad for you as the ears are not allowed to rest enough.
Ear plugs are a great thing for concerts, they only cut the really annoying frequencies anyway. Most of the time with earplugs you can tell how shitty the band is live anyway; most really loud bands suck live, that's why they turn it up
. I bring along my earmuff hearing protectors to NHRA events everytime, When those Top fuel cars go down the track it's ungodly loud. A buddy of mine and I rode our motor cycles to the opening event at Rt 66 several years ago, we were a mile or more away in traffic and as the Top fuel cars were running it was setting off car alarms that far out. Totally awesome.
Even with the earmuffs on the cars were so loud it distorted my vision while we were at the starting line. If anyone here hasn't gone to an NHRA event; it's a must! Kinda makes running 12's look pretty insignifigant.