A strange thing that sometimes happens after I flush.

This has happened twice in the past few days. When I flushed the toilet,something below me made a huge creaking sound and the floor of my bathroom was vibrating. I'm thinking it has something to do with the pipes, but I'm not sure. I'm worried that something bad might happen like the pipes might break or something.

Any suggestions on what I should do would be greatly appreciated.

I'd first shut off the cold water supply to the toilet and then flush once. Do you hear the noise? If yes, the problem is in the drain. If no, then the problem is probably in the water supply.

noise

You probably need a new toilet tank fill valve.

I agree......

Mine vibrates sometimes, but it's not the toilet's fault!