###Human: Can dehydration result in dizzy feel and lightheadedness? ###Assistant: Hello. You are too young to have high blood pressure. There could be many reasons for dizziness. The most important one is being orthostatic hypotension if you are on a blood pressure (BP) medication. Others could be thyroid disorder, anemia, vitamin B12 deficiency and diabetes. If all the work up are negative; it could be problems related to inner ear like benign positional vertigo or Meniere's disease. You should be investigated for secondary causes of hypertension. Remember the BP goal has been changed to more than 140/90 mmHg if you have no other medical conditions other than hypertension. Consult your PCP (primary care physician) or endocrinologist for secondary hypertension. If all investigations and BP are fine then consult an ENT (ear, nose and throat) specialist. CBC (complete blood count), TSH (thyroid stimulating hormone), CMP (comprehensive metabolic panel), angiotensin or renin activity, morning AM cortisol level, VMA (vanillylmandelic acid) in the urine or metanephrines. 1. Consider reducing the dose of antihypertensive medication. 2. Use Meclizine on as needed basis. Please do not drive while taking it. For further information consult an internal medicine physician online.--->