My toilet is making funny noises!

United States
June 25, 2008 6:17pm CST
For the past week our toilet has been acting funny. Everytime the toilet is flushed, a high pitched piercing sound comes out of the water tank in the back. It's made this sound before, but today the sound continued for three minutes. Then it stopped. I don't have the money to have a plumber check it out. So, I'm looking for do-it-yourself answers to this issue. Other than the high pitched screaming noise, it's working fine and we've had no other problems. No back ups, either. It's just the noise and I'm worried that it could be a sign that something big is about to go wrong. Has this ever happened to anyone else? Why is it making that sound? And what would be the solution? Would love some suggestions.