Heel (calcaneal) spurs are a common feature found on x-ray of the heel and may be associated with pain or may not.  They are found in sufferers of plantar fasciitis and in asymptomatic individuals.

Essentially the bony spur is an outgrowth of bone extending from the surface of the heel at the point where the plantar fascia begins.  Treatment of heel spurs is only necessary where they are painful and associated with plantar fasciitis.  In asymptomatic individuals they may be left alone.