“Difference between plantar fasciitis and heel spurs lies in the source of the pain. Pain from plantar fasciitis is typically felt in the arch of the foot and the heel due to damage or overuse of the plantar fascia. Heel spurs, or tiny jagged calcium deposits on the heel bone, develop in response to the trauma to the plantar fascia and are localized to the heel.   Plantar fasciitis is most commonly caused by repetitive strain injury to the ligament of the sole of the foot.  Heel Spurs are caused by long- term straining of the muscles and ligaments around the heel”

Heel that pain (heelthatpain.com)