Functions:
Heels give us support in standing. Heels complete the foot and so help in all foot movements.
Diseases:
Heel is based on one bone known as calcaneum and the heel pain mostly diagnosed as the calcaneum spur means sore tendon of the calcaneum bone resulting in the heel pain causing difficulty in standing, walking etc foot movements.
Interesting Facts:
To reduce the heel pain and reduce the tension, just roll a bottle, tennis ball or any other rolling thing under your feet.