A foundation problem can have a number of symptoms. Including but not limited to interior and exterior wall cracks, cracks in the concrete slab foundation, sinking or unlevel floors, gaps between the walls and the floors to name a few.
Stem walls are a part of the slab foundation system. A buildings stem wall attaches the walls of the home to the foundation. Stem walls are often composed with concrete and rebar. Given enough time and the right conditions, a number of stem walls will fail regardless of how well they were constructed. Variables such as moisture (either from the weather or landscape) may cause oxidization of the rebar contained within the home's stem wall.