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Q. Can dehydration result in dizzy feel and lightheadedness?

Answered by
Dr. Sadaf Mustafa
and medically reviewed by iCliniq medical review team.
This is a premium question & answer published on Aug 11, 2018 and last reviewed on: Sep 10, 2020

Hi doctor,

I am 23 years old. For about four weeks, I have been experiencing lightheadedness. It happens a few times each week. I never pass out, but I get very hot and feel like I might pass out. I have also not had an appetite. I have lost about 5 pounds from not being hungry. I went to the doctor and he said that I was very dehydrated. I drink water throughout the day, but began to drink even more now hoping my symptoms would go away. One week later, I am still having the same problem. When I am out for a run, I often have to stop because I feel very dizzy. When I eat, I often have an upset stomach and have loose bowel movement. After eating, I feel very nauseous. Should I try to make another appointment with my doctor or wait to see if my symptoms improve?

Dr. Sadaf Mustafa

General Medicine Internal Medicine


Welcome to

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.

Investigations to be done:

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.

Treatment plan:

1. Consider reducing the dose of antihypertensive medication.
2. Use Meclizine on as needed basis. Please do not drive while taking it.

Regarding follow up:

For further information consult an internal medicine physician online.--->

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