Could be a partial blockage that would require a rooter for the sewer drains or that there is a blockage in the toilet trap itself.

If you are on a spetic system it could also indicate that your tank needs to be pumped.

If you are in a cold location, it could mean your soil stack vent through the roof could be frozen and blocked.

Thanks for the reply. I am on a city sewer

system, and with the warmer temps lately,

I don't think the vent is frozen. I have

put a snake (3ft) down the toilet, and

nothing has changed. A second toilet in the

house works fine, so I don't think there is

a blockage, exept maybe in the short line

from the problem toilet to the main line.

If you have any other ideas, let me know.

Thanks again.

If there is an obstruction in the trap of the toilet like a comb or something else small, a snake will simply go right passed it and have no effect removing it.

It often takes removing the toilet and accessing the trap below with a wire to probe and dislodge any obstructions.

You might take the toilet off and pour a bucket of water directly into the drain to see if it flows easily.

This might help you isolate where the obstruction may be.