Water is the primary cause of flaking paint on bathroom walls and ceilings as well as on exterior walls.
Paint on ceiling in bathroom is peeling.
To keep bathroom paint from peeling run a bathroom fan that s vented to the outside every time you shower or bath and keep it running for 10 15 minutes after you re through to expel as much of the moist air as possible.
When water penetrates through the coats of paint it causes the layers to separate and detach from the surface.
Your bathroom walls and ceiling probably started peeling in the first place because they weren t properly primed.
The water can originate from a leaking roof gutter flashing or soffit.
To stop future peeling and damage to the wall or ceiling surface reseal the area using paint and primer.
Peeling paint is a common problem in bathrooms due to the high humidity and moisture found there.
To avoid the same problem in the future use an oil based primer with.
Then using a putty knife wire brush or paint scraper carefully remove all the chipped or peeling paint.