Pronation is a very common foot problem. Some foot bones drop to a less stable position if the foot arches are too weak to keep them properly aligned. The arches may be unnaturally stretched ("flat feet"), increasing stress. Another common problem is plantar fascitis, a stress irritation to the elastic tissues running nearly the entire length of the foot. Heel spurs - deposits of calcium on the heel bone - are another common problem. If untreated, feet can become "tired and achy" or hurt. You should contact your chiropractor right away if you have foot pain.