If you have a leaky tub, you want to find the leak and repair it before further damage occurs.
There are many reasons why tubs leak including: leaky drains, pipes or the tub itself. Leaking tubs are not as uncommon as people think.
They do deteriorate with age.
The problem might be a simple situation like missing grout or something more serious such as a worn fixture that needs replacement.
In the long run, a visit from an experienced plumber will be cheaper than a temporary fix that you would do yourself.