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Antioch, CA
A 43-year-old female asked:

i get very lightheaded, dizzy and my vision goes dark when i first stand up. i literally have to hold onto something for about 30-45 seconds. i don't have any health insurance, what could it be?

2 doctor answers3 doctors weighed in
Dr. William Goldstein
Ophthalmology 31 years experience
Low blood pressure: Low blood pressure or low blood volume (dehydration can cause that) can make it difficult for your heart to pump blood up to your head when you stand up. There are other more rare causes, but you should probably see a doctor to check it out. This problem is called orthostatic hypotension.
Dr. Dan Fisher
Internal Medicine 27 years experience
Low output: You're describing symptoms of low cardiac output. This is either due to volume depletion or inappropriate cardiac response. You should see a doctor if maintaining good hydration.

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Alexandria, VA
A 40-year-old female asked:

Why am I sometimes extremely dizzy after exercise? I work out frequently, eat well, drink more than 8x8 glasses of water a day.

2 doctor answers2 doctors weighed in
Dr. Robert Kwok
Pediatrics 33 years experience
Can be other causes: Dizziness with exercise doesn't just happen with inadequate hydration. If a person is well hydrated, and still gets dizzy, her doctor can evaluate. Sometimes there are circulation problems, such as not enough blood flow to the brain under certain conditions or activities. There can be heart problems, or not enough red blood cells (anemia), etc...

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Last updated Sep 28, 2016
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