Among other things, pain on the side of the foot can be caused by abnormal growths, ligament problems, or a problem involving one or more nervous -- read more
here.
Overuse and/or being overweight often cause foot pain symptoms to worsen -- regardless of the underlying cause.
A podiatrist or an orthopedist will have to examine you in order to determine the exact cause and most appropriate/effective treatment.
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Good Luck!
Steve
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