Plantar Fasciitis is a sharp pain that starts on the bottom of the heel bone then radiates along the arch of the foot, to the sides of the heel.

(Learn More)  Plantar Fasciitis

Achilles Tendonitis is pain that is on the back of the heel and will travel up the back of the heel into the calf muscles and Achilles tendon. 
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(Learn More) Achilles Tendonitis