SFMA is a movement based diagnostic system which systematically finds the cause of pain - not just the source - by logically breaking down dysfunctional movement patterns in a structured assessment.
Look at it this way. When you head to the hospital for shooting arm pain, the immediate course of action is to check your heart, not your arm. The pain down your arm is just a result of a problem elsewhere in the body. Similarly, the SFMA focuses on underlying dysfunctional movement to find the cause of pain, not just the source.