Cracks in your foundation are caused by a variety of reasons. It's often caused by the home settling into the soil over time. Other reasons can be hydrostatic pressure, which means the water in the soil is putting constant pressure on the foundation walls. Or it could be something as simple as your downspouts not draining the water effectively and allowing it pool up against the home. The best way to find out why there is cracks in your foundation and what's the best possible solution is to call an expert like Thrasher and have us come inspect your home.