One of the reasons for burning feet is uncontrolled glucose - is his glucose controlled?? - if not he must go and see his doctor to change his treatment in order to ensure better control. His HbA1c must be less than 7%. it can be due to neuropathy too - his doctor can help with treatment for that. Other possible causes may be vascular impairment or vitamin deficiencies - I really recommend to go and see his doctor to identify the problem and then to receive the appropriate treatment.
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