Medial midfoot heel pain, significantly with extended bodyweight bearing, may very well be due to tarsal tunnel syndrome, that's caused by compression of the posterior tibial nerve. Sinus tarsi syndrome manifests as lateral midfoot heel pain and a feeling of instability, specifically with improved exercise or walking on uneven surfaces. https://www.theorthopaedicandpainpractice.com/a-comprehensive-guide-to-treating-foot-heel-pain/