When your shower drains, does your toilet bubble? This is due to something called wet venting. Usually your fixtures will vent through a vent pipe, but if there is a blockage, your toilet might be the closest option to vent when your shower is running. This can also affect the speed at which water drains from your bathroom fixtures. To resolve the problem, you can start by clearing the shower drain using a snake. You should get it cleaned as far down the line as you can. If the toilet still bubbles when you run the shower after this, you can attempt to plunge the toilet as well.
It is possible that the plug is in the vent itself. It might be worth a visit to your roof to see if there are leaves and debris, or even some animal nest, plugging the vent up top.
You can pour water down the vent to see if it backs up. If this is the case, you might be able to use a plumbing auger to remove the clog. If none of these things work, it might be time to call a plumber.
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