QUOTE(katyjay @ Feb 17 2006, 02:45 PM)

Hi Meerkat
Your voice happens because your vocal cords vibrate as air passes them to produce sound. Generally, when we talk about damaging voices we mean doing harm to the vocal cords so that they don't produce the sound you want or, in drastic cases, any sound at all.
Most common, and thankfully temporary, is something like laryngitis, where the cords are inflamed and won't vibrate. It's cured by resting and waiting until the voice returns. And the more you push the cords to work while they're not right, the longer it will take for the voice to come back.
Have a look through Satine's posts on this forum. She's had a lot more serious vocal trouble, from straining her larynx too much as a result of poor technical training, I believe. She's recovering slowly now, but has had a great deal of set back.
At the worst, if one has really strained one's cords to excess, the voice can go altogether, and not come back. This happened to the pop singer (and later Irish president) Dana. She had to take a year off singing until her throat recovered, and then had to re-train to sing again.
My own near-miss happened when I was in my early twenties. I was doing a holiday job as a telephone operator for BT, and came down with a cold which (typical for me) hit my throat. My supervisor wouldn't let me go off shift, so I was there for eight hours and in that time I literally talked my voice away. As a result, I had such severe laryngitis I couldn't say anything for a fortnight, and couldn't sing for nearly three months. It took ages after that before the singing sounded right, too.
For that reason, I'm now ultra-cautious about what I do when my throat's dodgy. Yes I sang a recital on Tuesday, but I had hardly spoken and hadn't sung since the previous Wednesday, and again have hardly spoken and haven't sung since. I have arranged for someone else (Deborah) to do the announcements at the concert tomorrow, and if I can find someone to sing my half of the duet with Amber I'll do so. And for the rest of the time I'll rest my voice.
Hope this helps a bit. Jod's probably the person to give you the full gory details, she studied this stuff.
Cheers
Katyjay
You've got things mostly covered, except that if you use your vocal folds when they are inflamed, or really overstrain them, you can develop a small lump on the side called a nodule. Nodules can be removed surgically, but that is risky. Better not get them in the first place.
A nodule and botched surgery finished the career of Julie Andrews. That is why it is important to make sure that your neck muscles are otherwise relaxed when singing, and that you don't dehydrate.
And don't use anaesthetic lozenges or sprays, they mask problems an could make you do something that would really harm your voice.
JoD