Plantar fasciitis is a common cause of heel pain, and can be incredibly painful. Our patients typically present with pain under the heel which radiates along the underside of the foot. Quite often, the pain is worst when getting out of bed in the morning. You may also have pain when trying to stretch up. The pain is caused by tiny microtears, scarring and a breakdown of collagen where the plantar fascia attaches on to the heel bone.