A: You may have Achilles tendonitis, which an inflammation or irritation of the Achilles tendon, which is located in the back of your lower leg, and which attaches to the back of your heel bone which can cause your heel to hurt. People with this condition often have tight calf muscles. Some people with pain in the back of the heel can have a heel spur, or bone spur at the back of the heel bone. For more information about Achilles tendonitis. Also visit our heel pain page for more information.