The problem is caused by an issue with the wax seal.
Water coming up from floor under toilet.
Another way to tell is to examine the drain from underneath which can be accomplished in the crawlspace or the basement.
Toilets are fixed to the floor using a pair of bolts which you can see on the side of the toilet bowl.
If you can take a picture of the toilet s base.
The best way to tell if this is your problem is to push down on the floor around the drain.
Leak coming from elsewhere.
If the water seems to come from under the toilet then it is possible that the setting seal or gasket is leaking.
If the water is in fact leaking from under the toilet you might be able to stop it by tightening the closet bolts that secure the toilet to the floor.
Tighten both of the bolts not just one in order to ensure that the bowl is properly fixed to the floor.
Find out how to fix the problem of water coming up through the floor around your toilet.
Then use a wrench to alternately tighten each bolt a little at a time.
The solution is that the toilet has to be taken up and the wax seal has to be replaced.
Be careful when refastening the toilet pan as too much pressure on the screws can cause the toilet pan to crack at the base.
Leaking drainpipes in a shower or a bathroom plug will let water underneath tile.
Use a slotted screwdriver or putty knife to pry off the caps that cover the bolts.
The toilet pan must be released from the tank and floor and a new seal fitted.
You should then be able to flush the toilet immediately and see if you get a leak.
Close them up tightly and you may find that water stops leaking from the base.