If the leak continues even after the shower is off then the leak is probably coming from a water pipe.
Shower leaking through floor into other rooms.
The water can run outside of the shower door area onto the floor of the bathroom and leak between the shower and the floor area.
Depending on which floor this shower is located you might see water or water marks on a ceiling or when you look in the basement or crawl space.
Just a note about shower or bathtub leaks over a garage.
This is a very common issue with tubs.
Tub and shower drains connect to p traps just like sink drains do and the traps can leak.
Check for cracks even very fine ones anywhere on the pan.
Then run the shower as normal.
Shower pan leaks leaky shower floor if your water leak is coming from your shower floor then it may be obvious already you have a broken shower pan.
The idea is to use the process of elimination and keep looking for any evidence of a leak each step of the way.
If you see a leak at this point there likely is a problem with the shower base.
If it happens that your shower or bathtub is located above your garage you can cut costs by having the plumber cut the ceiling under those pipes and replacing it with a removable door.
If your pan or floor looks good try this basic step.
Once done with the shower check the towel for any water.
If you find some you re in for a new shower pan or shower floor to stop the leak.
Place a dry towel just outside the door.
Water can also seep past strainers that aren t properly connected to the drain and in.
Call a plumber to inspect or fix it for you as soon as possible to prevent rot odors and high costs of repair.