Pain during your first few steps out of bed in the morning? Plantar fasciitis is one of the most common causes of heel pain. It involves inflammation of the thick band of tissue on the bottom of the foot, known as the plantar fascia, that stretches from the heel to the toes. Plantar fasciitis commonly causes severe stabbing pain on the bottom of the foot with the first few steps out of bed in the morning. As someone moves around and walks more, the pain will usually decrease,