If you wake up in the morning and your first few steps feel like you are stepping on a nail or glass, you are not alone. Plantar fasciitis is one of the most common causes of heel pain in adults. About 1 in 10 people will experience it at some point in their life. Runners get it. People who stand all day get it. Even people who are not particularly active can develop it. But here is something important most people do not know: Plantar fasciitis is not primarily an inflammator