Though plantar fasciitis can arise without an obvious cause, factors that can increase your risk of developing plantar fasciitis include:
-Age: Plantar fasciitis is most common between the ages of 40 and 60.
-Certain types of exercise: Activities that place a lot of stress on your heel and attached tissue — such as long-distance running, ballistic jumping activities, ballet dancing and aerobic dance — can contribute to an earlier onset of plantar fasciitis.
-Foot mechanics: Being flat-footed, having a high arch or even having an abnormal pattern of walking can affect the way weight is distributed when you're standing and put added stress on the plantar fascia.
-Obesity: Excess pounds put extra stress on your plantar fascia.
-Occupations that keep you on your feet: Factory workers, teachers and others who spend most of their work hours walking or standing on hard surfaces can damage their plantar fascia.
Source: DrFoot Website