Q: What is planter fasciitis? A: This usually begins as a tenderness or mild discomfort on the sole of the foot, in the heel or arch area, and then becomes more severe. The plantar fascia is a tough ligament-like band of tissue that runs from your heel, through the arch area, and out to the ball of the foot. If you over-pronate (feet roll in), the plantar fascia becomes strained, with most of the stress occurring at the heel. Over-the-counter insoles may provide some relief, as can supportive taping, but custom orthotics is usually the best long-term solution.