The scariest 4 letter word for most homeowners is MOLD! Any home or building can grow mold under the right conditions such as high humidity above 60% and water leaks around home such as under sinks, water heaters, hidden plumbing or from roof leaks. Most of us store as many personal items under our kitchen and bath sink cabinets, this condition obstructs the view of the plumbing and the surrounding materials. If you have a leak under a sink that is blocked by storage you will not see it until it becomes a much bigger problem such as mold growth.
Home Maintenance Tips: I recommend inspecting under your sinks for leaks (with a bright flash flight) the same time you change smoke detector batteries or same time you change HVAC air filters.