If you have ever experienced standing in the restroom, minding your business brushing your teeth, and suddenly see bubbles coming up from the toilet, then you might worry about what could be down there.
Stories of critters and crocodiles living in the sewer systems of large cities are passed around for generations and, it's easy to let your imagination run wild when you see those unprovoked bubbles coming up from the drain.
In Reality, a bubbling toilet is a relatively frequent situation, and there are (luckily) several things which you can do to fix the problem:
First, it is essential to identify if other plumbing fixtures in your home are also having issues. You want to see if any of the sinks drain slowly, if another toilets bubble also, etc.. But, also to see whether any particular scenario induces the bubbling. For instance, if you turn the washing machine and the bathroom bubbles -- this can be excellent information to get because it narrows down the probable causes of the bubbling.
Next, carefully climb onto the roof of your home and check to be sure that the air vents are clear of debris, leaves, and nests. This time of year, there's a good deal of rubbish blowing up in the atmosphere and, it all may block an air vent from allowing sewer gasses to escape. After the gasses make it into the vent and find it is blocked, they'll travel back the way they came and out the toilet causing bubbling from the drain.
Eventually, when you have noticed that a faucet or fixture in your house is leaking, then it might be a bigger problem than just some dripping water. If there is a pipe that's cracked, it could be causing some serious issues like air pockets and bubbling toilets.
If your bathroom toilet is still bubbling, be sure that you contact a professional plumber. It's crucial to have situations like this addressed right away as they could quickly escalate into something much worse -- that will be more expensive and disruptive to fix.