Pressure: Tightness in smooth tissues e.g. ligaments, muscles and tendons, is a standard reason for bone spurs in ft. The limited tissue pulls on the A part of the bone that it's hooked up too, creating extreme tension and native inflammation e.g. limited calf muscles/Achilles tendon leads to heel bone https://www.theorthopaedicandpainpractice.com/what-are-spurs-on-the-foot/