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Why is My Toilet Bubbling When the Shower is Running?

If you’ve ever witnessed bubbles coming from your toilet when you ran the shower, you’ve probably wondered what might be creating such an odd phenomenon. This problem could have a number of causes, and in this article, we will look at five of the most typical explanations for why your toilet bubbles when the shower is running

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Why is My Toilet Bubbling When the Shower is Running?

1. Clogged Drain Vent

A blocked drain vent may be the source of bubbling sounds coming from the toilet. It’s important to keep drain vents clear of trash and other obstacles so air can move freely through your plumbing system and prevent water from backing up. Because of the obstruction, your toilet bowl may fill with air, causing annoying bubbling and gurgling sounds.

2. Partially blocked drain line

A drain line that is just partially obstructed is yet another potential reason why your toilet is bubbling. If your shower and toilet share a drain line, a clog in either fixture’s drain line might cause water to back up into your toilet bowl, which can lead to the formation of air bubbles. There are numerous potential causes of this clog, including hair, soap scum, and other types of debris.

3. Water Pressure Issues

Problems with the water pressure in the home are sometimes the root cause of a bubbling toilet. If the water pressure in your home is too high, it can cause air to become trapped in your plumbing system, which will cause your toilet bowl to gurgle and bubble. This can be remedied by lowering your water pressure. Another factor that might contribute to this problem is low water pressure, which makes it easier for air to get into your pipes.

4. Improperly installed plumbing

Poor plumbing installation could be to blame if you have a bubbling toilet every time you turn on the shower. Incorrectly connecting the shower and toilet drain lines, for instance, might lead to the accumulation of air in the bowl of the latter. Similarly, a buildup of air in your plumbing system might cause your toilet to bubble if it is not ventilated properly.

5. Main Sewer Line Issues

Finally, problems with the main sewer system can lead to toilets bubbling when the shower is turned on. Water can back up in your pipes and cause air bubbles in your toilet if your sewage line is obstructed or broken. The diagnosis and repair of this problem are probably best left to licensed plumbers.


In conclusion, if you notice bubbling coming from your toilet while you run the shower, there are a few different potential explanations to consider. A clogged drain vent, a partially blocked drain line, poor water pressure, improperly installed plumbing, or issues with the main sewer line could all result in problems. You will be able to take action to identify and fix the problem if you are aware of these probable reasons. As a result, you may be able to avoid more significant plumbing problems in the future.


If your toilet is bubbling, it could be an indication of a more serious problem with your plumbing. If you want to be sure the problem doesn’t get worse, get a plumber to come take a look at it and fix it.

You may be able to fix a toilet that is bubbling on your own by removing any obstructions or debris from the pipes. A professional plumber should be called if the issue persists or is related to the main sewer line.

A clogged drain vent, a partially blocked drain line, high water pressure, poorly installed plumbing, or a problem with the main sewer line are all possibilities.

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