When your heel starts to hurt, even walking can be difficult and incredibly painful.

The American Podiatric Medical Association says possible causes of heel pain include:

Heel spurs, which are bony growths that develop on the heel.
Inflammation of the fascia, known as plantar fasciitis.
Excessive pronation, or inward tilt of the foot as you walk.
Achilles tendinitis, in which the tendon at the back of the foot becomes inflamed.
A deformity, injury or chronic disease, such as rheumatoid arthritis.