Sometimes old injuries or congenital problems can make one foot more likely to have problems and the other. We must remember that we are not totally symmetrical. One foot is usually slightly bigger than the other and often one leg is slightly longer than the other. A bigger foot may be cramped in the shoe and a longer leg they are slightly more weight than a shorter leg. Often, a professional examination can determine exactly what the reason is that one of your feet is always the “problem” foot.