Your drain line is plugged somewhere after your shower and toilet line are connected. The reason for the gurgle in your toilet is because air is trapped in the drain and your toilet is the closest place for air to flow to. If you had a vent on your toilet trap arm then it would gurgle in the vent rather in your toilet but your drain is still plugged and needs to be snaked out and maybe your drain line needs to be examined for right grade or broken.
The shower gurgles because the water is going down the pipes.
When you take a shower, you're mixing a combination of hot and cold water to make a comfortable temperature for the shower water. A toilet draws only off the cold water system. In older or poorly designed plumbing systems, when you flush the toilet, the cold water is pulled by toilet, so the water coming through the shower is only drawing from the hot water tank.
Because it effects the water pressure of the shower. This causes the temperature of the water in the shower to also change.
First thing you should do is call a plumber. Drain lines are not supposed to leak. Your drain line is clogged and needs to be snaked out and the leaking pipe repaired.
Because someone is using water somewhere else. For instance, if you are having a shower and someone flushes the toilet, the water going to the shower is decreased because some is going to the toilet now.
It won't change when you flush the toilet. :)
They share the same drain system. Be thankful that flush water etc from the toilet does not bubble in the bath or shower. But it is a badly designed system, it shouldn't happen.
Because the two pipes are connected, and the shower is farther down the line than the toilet. So when you flush, you are hearing the water from the toilet pass by your tub. This is also why you will have sewage in your tub if your waste water line is extremely backed up.
Incorrect pipe size installations
One of the easiest and least expensive fixes for this problem is to adjust the flow of water into the toilet. If the toilet fills more slowly, it will not alter the water pressure enough to change the temperature of the shower. Another possible solution, which would require the purchase of a special valve and possibly installation by a plumber, is to install a thermostat-controlled water valve in the shower to keep the water flow at a constant temperature.
Maybe, but certainly not much
Install a new pressure balancing valve in shower which helps with problem.
This is not an uusual as when the toilet is flushed more cold water is drawn usually from the cold water pipe that suplies the shower with cold water so generaly the water under the shower gets hotter. The only way to stop this from happening is to lay an extra pipe all the way to the ater suply point, or fit a pump to maintain the presure
Code allows your plumber to supply three fixtures using 1/2 tubing. In most bathrooms, you only have three fixtures (tub/toilet/lavatory). So most plumbers only run 1/2 pipe to supply the bathroom. Code allows this. Personally, I find this layout a little short-sighted.Anyways - when someone flushes, the toilet requires water to refill. Which means your shower is now sharing that water supply with the toilet as the toilet refills. What I love best is when you re-adjust the shower valve...then the toilet quits filling...and you scald yourself. Lots of fun there.Your problem is caused by poor plumbing (my opinion) or if you are in an older home, galvanized pipes tend to corrode from the inside which only makes the condition worse.If you like to do things yourself, carry over a 3/4 line and pull 1/2 take-offs for each fixture and the problem will be solved.In a straight : When you shower you are using both hot and cold at the same time and when you flush the toilet you are causing the homes cold water to be guided more through the toilet line including the cold water that you are using from the shower line.:If a few words, water pressure and flow are inversely related. The more flow you have, the less the water pressure. Since the toilet and shower are connected to the same water supply line, when there is flow into the toilet, it takes away from the shower. Since cold water is used to supply the toilet, it takes away from the cold water flow to the shower. With the same amount of hot water flowing, the temperature of the water in the shower will get hotter.
Supply lines- Hot and cold water for each sink, bathtub, Jacuzzi tub, and shower. Cold water for each toilet. Drain lines- one for each sink, bathtub, Jacuzzi tub, shower, and toilet.
Grey is usually dirty water but not toilet water (shower, sink drain) Black (or Brown) is sewage from the toilet. If you have a motorhome there will be two sewage tanks... "grey" and "black"
Same reason they call a shower a rain locker
Anything connected to water pipes. Sink, faucet, toilet, shower and controls.
Somebody running cold water or flushing toilet in the house..
Run a new cold supply line from the source. This will drain less pressure from the the cold shower line.
dont flush the toilet for a week and take a shower twice a month
Sound like you have a clogged toilet and or a clog in your main drain under your toilet. Shut off water supply to toilet remove water from toilet tank. Puchase a wax ring for your toilet prior to disconnecting toilet from supply line and floor bolt on the right and left of your toilet. Remove toilet from floor if water is standing in pipe under where toilet was this is where your problem lies. If no water or clog present, turn toilet on side and lokk in hole at the bottomof toilet. Clear was is stuck in toilet clean off old wax ring install new one and put toilet back together.
You need either a new O ring in the shower or tap anew washer in the tap, or you should go to the toilet before showering.
Unless it is a very strange arrangement, turning off the toilet on the first floor should only shut off the water to that toilet. It should have no effect on the upstairs shower.
A toilet. Same reason a shower is called a rain locker