The plantar fascia is a band of tissue that runs under the sole of the foot from the heel bone to the base of the toes. Inflammation of this tissue—plantar fasciitis—is most commonly caused by repeated overstretching the tissue during physical activity.
The main symptom is pain under the heel, which is usually worst after periods when no weight is placed on the foot.
Treatment includes rest, ice packs, and pain relievers.
Exercises to stretch the tissues and special shoe inserts may also be recommended. Severe cases may be treated with an injection of corticosteroids

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