Differential Diagnoses Although it really is acceptable to think that heel pain will have to stem from a heel, it's not normally the situation. There are other situations that may mimic plantar fasciitis, Achilles tendonitis, and other will cause of heel pain. XC Gel® packs have two distinct colored sides: https://www.theorthopaedicandpainpractice.com/the-ultimate-guide-to-foot-pain-tendonitis-treatment/