Plantar fasciitis is an inflammation of the plantar fascia, a band of tissue under the foot.
Plantar fasciitis accounts for about 10% of running injuries, and is probably the most common foot injury.
Typically, a low grade pain gradually occurs in the arch and/or heel of the foot. Initially this may not be so severe as to interrupt training. However, with continued training, the pain may worsen until it becomes impossible to continue. The most characteristic symptom of plantar fasciitis is pain on standing first thing in the morning. Throughout the day, the pain will return and get worse, usually after rest.