ceiling water stain cause 22

https://mighty-wiki.win/index.php/How_to_Tell_If_That_Ceiling_Water_Stain_Is_From_Attic_Condensation_or_a_Roof_Leak

Ceiling water stains usually come from a leak above, maybe from a broken pipe, a faulty roof, or an overflowing bathtub. That yellowish ring grows over time as water seeps through drywall, carrying dirt and minerals. If you ignore it, the moisture can weaken the ceiling and lead to mold.