The most common cause of heel pain is plantar fasciitis. It is sometimes referred to as heel spur syndrome, though no bone spurs develop due to this condition. Usually, faulty foot structure causes a strain on the fibrous connective tissue that stretches along the bottom of your foot from your heel to your toes. This band of connective tissue is called the plantar fascia, which becomes inflamed and irritated by excessive strain. Dull or sharp pain can be present with plantar fasciitis.