In patients who either have hypertension at a young age or are not responsive to numerous medications, your physician may consider causes of hypertension such as renal artery stenosis (blockage of the
kidney artery), pheochromocytoma, coarctation, thyroid conditions, parathyroid conditions, aldosteronoma, among other things. This is not to scare, but rather to entertain the possibility of reversible hypertension which are treatable.