In plantar fasciitis, the muscle band beneath the foot may perhaps develop tiny tears and inflammation from recurrent strain, leading to pain and swelling within the foot. It may also influence just one foot or both of those feet. Sharp Pain: Widespread in Plantar Fasciitis, this pain is worst each morning right after rest, https://www.theorthopaedicandpainpractice.com/why-does-the-back-of-my-heel-hurt/