Recent head injury, hyperthyroidism, renal artery stenosis (by dopplar studies or MRI), abnormal kidney function
(by kidney function
tests), hyper function of adrenals, Cushing’s syndrome, abnormal liver function etc need to be ruled out. To diagnose the cause tests like kidney function, liver function, lipid profile, thyroid, adrenal gland function, EKG, ECHO, tread mill etc are done.
Please discuss with his treating doctor to know what tests have been done and what needs to be done.