Look into plantar fascitis....
It can be caused by several things, the type of shoes you wear, how much you walk, and how much weight you carry.
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Plantar fasciitis, arthritis of small joints, diabetic neuropathy, hypothyroidism, high blood pressure, over weight, deep vein thrombosis, wrong foot wear, gout, etc are a few causes of painful feet.
Do discuss this with your doctor and get yourself examined. You may need to consult an orthopedic specialist or a rheumatologist. Take care!