Plantar fasciitis is a common foot condition that causes pain in the heel and bottom of the foot. It occurs when the plantar fascia, a thick band of tissue that runs across the bottom of the foot, becomes inflamed. This inflammation often results from excessive strain, such as from running, standing for long periods, or wearing improper footwear. People with plantar fasciitis typically experience sharp pain, especially in the morning or after sitting for a while. Treatment options include stretching exercises, ice therapy, and supportive shoes. In some cases, a doctor may recommend physical therapy or custom orthotics to help relieve the pain.