About 2 million Americans are treated for plantar fasciitis every year. A familiar explanation for heel pain in adults, it impacts almost one in every 10 people. Traced to structural changes in the underside of the foot, this painful disorder is common among athletes, seniors, and those impacted by obesity. What is Plantar Fasciitis? Plantar fasciitis refers to pain in the heel linked to structural changes, inflammation, injury, or scarring in the plantar fascia, a ...