Burning on the bottom of the feet is most frequently due to a peripheral neuropathy. This is a length dependent process which affects the parts of the nerves furthest away from the body (i.e. the toes followed by the feet). There are many causes to neuropathy such as diabetes, rheumatologic disease, vitamin deficiencies, blood disorders (i.e. paraproteinemias such as Multiple Myeloma or other monoclonal gammapathies), kidney failure and infectious processes such as syphilis. There are also genetic disorders that cause peripheral neuropathy the most common being Charcot Marie Tooth disease.Sometimes nerve roots impingements of the back can mimic a peripheral neuropathy, particularly S1 nerve root impingements.
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There may be more than one reason for burning sensation in the bottom of the feet. Some common causes include diabetes, nerve damage, radiation therapy and some medications. You may need to consult a specialist to find the exact cause for burning in the feet.