A drain leak, a leaking shower pan, a leaking shower valve or piping, a leaking bezel or escutchions on the shower valve, bad or missing grout, bad caulking in the corners of the wall, a leaking shower door, water spilled on the floor, or, a drain pipe leak. any one or combination of the listed problems can do it. Look things over take care of what you can see wrong before making a hole in the ceiling. If you think you have fixed the leak repaint the stained area but prime 1st with Kilz or Binz to cover the stain or it will reappear through the paint even if the leak has stopped. If the leak hasn't stopped from taking care of the things you could see then open up a hole to see where it is coming from.
Bad shower valve.
Gravity. Also- If someone takes a shower with the curtain on the outside of the tub this can happen.
This could be caused by your exhaust fan not properly removing moisture from your bathroom. It is always a good idea to use some X-14 (a mildew remover) every coupke of weeks when you start to see mildew. It is cause by lack of air flow in your bathroom, or a leak from upstairs. Is there is an upstairs bathroom? If so you might have a small leak somewhere in the supply or drain lines in the upstairs bathroom. If not a leak then possibly condensation is forming on a shower or tub above this bathroom.
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.
the shower and bath water comes from two different places so their is two different pipes. Get the shower pipe checked out by a plummer and they cause fix the pipe.
Shower body or pan not properly supported or the joint not properly caulked possibly a fiberglass pan with plastic piping
When the water pressure in your upstairs bathroom is getting low and you find a white sediment buildup in the aerator of the sink, it is the most likely cause of low pressure. You can also find the buildup in other fixtures including the shower valve and cartridges. Cleaning the sediment from the parts helps restore pressure.
This is not advisable beside not being legal, This may potentially cause sewer gas leak into your resident.
A price floor can cause a surplus while a price ceiling can cause a shortage but not always.
No.
It is much safer to take a bath than a shower cause in the shower you can slip so I would bath
cause you dont shower