Use kettle hot water or plunge the drain with a basin plunger or use a 2 inch spring wire to loosen waste inside the pipe
Use a Plumber's "snake".
The shower drain and waste lines on up to the other fixtures located above need to be clear so that water will flow. Just downhill of the shower drain there is probably a blockage in the waste pipe. The blockage could cause slow draining. If it is completely blocked, the shower pan will not drain back out over time. You will need to run a plumbers snake down the line below the shower drain. If the toilet in the same room as the shower when flushed also shows water coming into the shower drain, it will be best to take up the toilet off the base and run a plumbers snake from that point. Warning for very slow draining lines or lines that do not drain, DO NOT use Drain cleaning chemicals. Good luck and you may wish to call rotorooter.
Stoppage
cloged
Flushing your bowels out with an enema with a slow stream from a shower is not good for you. Even with a slow stream from a shower, this can still produce harmful results, due to the pressure of the shower.
You use it during the shower.
The main drain is plugged. Not completely, but enough that it is easier for the upstairs water to come out in the shower and floor drain instead of going out the drain.
Depends what shower you have.
Shower drains can become clogged with hair and soap quickly, causing the water to become slow in draining. If you notice this, remove the shower drain by pulling up on it. If it doesn't release easily, it is probably screwed down and you will need a screwdriver to remove it. Once the drain cover is off, pull the debris out of it with a bent hanger or by using your hands, but be sure to wear rubber gloves if you are coming in direct content with drain debris. To improve the smell, dump a mixture of baking soda and vinegar into the drain and run the water.
yes
shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio shower radio
Yes