Plantar fasciitis is a painful condition that affects the bottom of the foot and heel. It is caused by inflammation of the plantar fascia, a thick band of tissue that runs from the heel to the toes. Common symptoms of plantar fasciitis include sharp pain during the first few steps in the morning, stiffness and pain in the heel, and pain after prolonged standing or walking. Treatment typically includes rest, stretching exercises, pain relief measures, and physical therapy to help manage symptoms and promote recovery.