What is Happening? How Does Plantar Fasciitis Cause Heel Pain?
The plantar fascia is a thick band of tissue that runs along the underside of the foot, connecting to the heel bone (calcaneus) to the base of the toes.
This band is part of your arch and flexes as you walk, storing and releasing energy. It’s normally very strong, but can still become overloaded. Tiny tears can form in the plantar fascia, often causing pain at or near the heel.
Why the pain after periods of rest, though? As the plantar fascia is relaxed, it tightens up and may even begin to heal. As soon as you start moving again, the plantar fascia is forced to stretch out again, creating new tears and reigniting the pain. Once the band has had an opportunity to “warm up,” that pain tends to recede.