I have a two story house. The master bedroom and bath are up there. When I flush the toilet in the master bath I can hear drain noise coming from the tub drain right next to it. It only does this in the master bath.

Hmmm... Are you hearing a glug...glug...glug sound? Or are you hearing the toilet flush through the tub?

Let me know what you can.

If glug... glug... glug then may be that the tub drain is slowly clogging up and needs to be snaked.

If hearing toilet through the tub then tub may not have a p-trap installed and that would certainly be a big issue for you (although highly unlikely).

Post back...

MARK

Let me add a bit to Marks answer. That glug-glug could be the system attemptinjg to vent through the tub trap due to a blocked vent. Amswer Marks questions amd then we can tell you more. Regards, Tom