If your bathtub is leaking, there are a few potential causes and steps you can take to resolve the issue:

1. Check the drain and overflow: If the leak is coming from the drain or overflow, you may be able to fix it by replacing the gasket or tightening any loose screws. If the issue is more complex, you may need to replace the entire drain and overflow mechanism.
2. Check the caulking: If the leak is coming from around the edges of the bathtub, it may be due to damaged or missing caulking. Remove any old or damaged caulking and apply a new bead of silicone caulk to seal the edges of the bathtub.
3. Check for cracks or chips: If the bathtub has cracks or chips, the water may be seeping through the damaged surface. You can try repairing the crack or chip with a repair compound, or you may need to replace the entire bathtub if the damage is extensive.
4. Call a professional: If you are unable to locate the source of the leak or if the repair is beyond your handyman skills, it may be best to call a professional plumber to diagnose and fix the issue.

Note: It is important to address the leak as soon as possible to prevent further damage and to minimize water waste.