Pressure: Tightness in smooth tissues e.g. ligaments, muscles and tendons, is a standard reason behind bone spurs in ft. The restricted tissue pulls on the A part of the bone that it is hooked up far too, leading to too much tension and local inflammation e.g. limited calf muscles/Achilles tendon https://www.theorthopaedicandpainpractice.com/what-are-spurs-on-the-foot/