Plantar Fascia is a thick band of tissue that runs across the bottom of your foot and connects your heel bone to your toes.
Under normal circumstances, your plantar fascia acts like a shock-absorbing bowstring, supporting the arch of your foot.
If tension and stress on that bowstring become too great, small tears can arise in the fascia. Repetitive strain and tearing can cause the fascia to become irritated or inflamed, which is called Plantar Fasciitis.
Such strain injury can be from excessive running or walk, poor shoes and compensating pattern of the intrinsic foot muscles.