Table of Contents
- Fainting (syncope) facts
- Introduction to fainting (syncope)
- What causes fainting (syncope)?
- Heart rhythm changes
- Heart structural conditions
- Heart valve conditions
- Sudden cardiac death
- Postural hypotension
- Vasovagal syncope
- Orthostatic hypotension
- Vertebrobasilar artery disease
- Electrolyte imbalance
- Other medications and drugs
- What are the signs and symptoms of fainting (syncope)?
- How is fainting (syncope) diagnosed?
- What is the treatment for fainting (syncope)?
- Can fainting (syncope) be prevented?
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Anemia (low red blood cell count), whether it occurs acutely from bleeding or gradually for a variety of reasons, can cause fainting because there aren't enough red blood cells to deliver oxygen to the brain.
Dehydration, or lack of water in the body can similarly cause fainting or syncope. This can be caused by excessive loss of water from vomiting, diarrhea,sweating, or by inadequate fluid intake. Some illnesses like diabetes can cause dehydration by excess loss of water in the urine.
Kasper, D.L., et al., eds. Harrison's Principles of Internal Medicine, 19th Ed. United States: McGraw-Hill Education, 2015.
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