I have a slow drip drip sound inside the wall that I can hear in my upstairs bathroom and in the interior wall underneath the bath (it's a townhouse). The dripping seems not to be related to prior water use -- I hear it at night if I get up to go to the bathroom, before I flush. I had something similar several years ago that went on for weeks, until my downstairs carpet next to the wall got wet. Then a plumber had to open the wall and repair something. Is this the same or am I just paranoid? Thanks.

You probibly have another leak... considering the amount of damage that can result from an unrepaired leak, that's being proactive... not paranoid.