Plantar fasciitis is irritation and degeneration of the plantar fascia, the thick band of tissue that runs along the bottom of the foot from the heel to the toes and supports the arch.

Achilles tendinopathy is a painful, degenerative condition of the Achilles tendon, which connects the calf muscles to the heel bone.

A Morton's neuroma is a thickening of the tissue around a small nerve that runs between the toes, most often between the third and fourth toes.

Ankle osteoarthritis is the gradual breakdown of the cartilage that cushions the ankle joint. Unlike knee and hip arthritis, it most often develops years after an injury such as a fracture or repeated sprains.