With this sequence:Plantar fasciitisAchilles tendinopathyAchilles tendon ruptureMetatarsal fracturesMorton's neuromaFlat ft and fallen arches A hammertoe can be a deformity with the toe that causes it being permanently bent in the claw-like posture. The irregular position can set amplified force over the ball from the foot leading to pain. Read through https://www.theorthopaedicandpainpractice.com/effective-treatments-for-ball-of-foot-pain/