By far, the most common cause of heel pain, plantar fasciitis, is inflammation of the plantar fascia, the tendon that runs along the bottom of your foot and around your heel. The plantar fascia tissue contributes to supporting the arch in the foot and distributing body weight across the foot. The plantar fascia bears up to 14% of the pressure exerted on the foot. When the plantar fascia becomes inflamed, doctors term the condition plantar fasciitis. Plantar fasciitis is often associated with abnormalities of the foot’s structure, such as high arches (pes cavus) and flat feet. Environmental factors can also cause plantar fasciitis – whether running on pavement or in worn out shoes, running long distances or increasing our training too quickly, or even by experiencing sudden weight gain, we can put undue strain on our plantar fascia.