Bursitis: Popping of a tendon is usually either chronic dislocating or the tendon rubbing an adjacent structure. Since the achilles really can't dislocate, it is likely rubbing on a small, fluid-filled sac underneath called the retrocalcaneal bursa. If it is painful and avoiding irritating shoes doesn't improve things, see a podiatrist. Sometimes a steroid injection can help.
Answered 5/7/2018
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