Do the rest of the fixtures in the bathroom drain well? If they do not drain well, my guess would be the venting of the Plumbing system. If all of the other fixtures in the bathroom drain well, then there is probably something in the trapway of the toilet. Assuming it is just the toilet that is having problems, then a closet auger might do the trick. Hope it helps.
When you flush the toilet, the sudden rush of water can create air bubbles in the plumbing system. These air bubbles can travel through the pipes and escape through the tub drain, causing the gurgling sound.
The main drain is plugged. You may need to remove the toilet and snake directly down the drain.
Water runs in the toilet bowl to maintain proper water levels and to flush waste down the drain when the toilet is flushed.
The toilet itself is plugged or the pipe from the toilet to the drain is plugged. It may be that the tub and sink have their own drain pipe that may connect to the main away from the toilet drain. Plunge the toilet or sometimes if you fill a 5 gallon bucket with water and pour it into the toilet as fast as it will take it, that will flush out the line. It is a greater amount of water all at once an forces out what the clog is.
A toilet may swirl but not flush properly due to a clog in the drain pipe, insufficient water in the tank, or a malfunctioning flapper valve.
To drain a toilet properly, turn off the water supply valve located behind the toilet. Flush the toilet to remove most of the water. Use a plunger to push any remaining water down the drain. You can also use a wet/dry vacuum to remove water if needed.
Water drains from the toilet bowl after flushing because the force of the flush pushes the water down the drain pipe, creating a suction effect that pulls the water out of the bowl.
either the vert is plugged and there is no air getting through or there is no vent at all
When you flush the toilet, it can create a vacuum in the plumbing system, causing air to be pulled through the drain. This air can pass through the water in the bathtub trap, creating a gurgling sound.
A flush valve is a mechanism in a plumbing system that controls the flow of water to flush waste from a toilet. When the toilet is flushed, the flush valve opens to release water from the tank into the bowl, pushing waste through the drain pipe and into the sewer system. The valve then closes to stop the flow of water once the flushing process is complete.
To completely drain a toilet, turn off the water supply valve located behind or near the toilet. Then, flush the toilet to remove as much water as possible. Use a plunger to push any remaining water out of the bowl and into the drain. You can also use a wet/dry vacuum to suction out any remaining water.
Your toilet may be bubbling after flushing due to a clog in the drain pipe, causing air to be trapped and released when the water flows through. This can create bubbles in the toilet bowl. It is recommended to have a plumber inspect and clear any blockages in the drain pipe to resolve the issue.