Heel bone (calcaneous) is not easy to break. A significant force, such as a motor vehicle accident or a fall from a height is usually the cause for heel fractures. If the heel is fractured, you will experience pain and inability to bear weight. The pain may be on the outer side of the ankle or, it may be focused in the heel pad. Your foot may become swollen and stiff. To avoid severe complications, it is imperative to see a physician immediately.