Vasovagal Reflex Quiz
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Blacking out
Fainted / passed out right after having food
Dizziness
Blackout for a second
Dizzy
Faint
Vertigo
Not seeing your symptoms? No worries!
What is Vasovagal Reflex?
Vasovagal reflex is a sudden drop in heart rate and blood pressure that leads to fainting. It can be triggered by stress, long periods of standing, heat exposure, or the sight of blood or anything unpleasant.
Typical Symptoms of Vasovagal Reflex
- Fainting
- Dizziness
- Feel unsteady or floating when I am standing
- Cold sweat
- Losing consciousness after moving my neck
- Feeling lightheaded or fainting after passing urine or stool
- Losing consciousness during or after meals
- Dizziness when standing or after prolonged standing
Diagnostic Questions for Vasovagal Reflex
Your doctor may ask these questions to check for this disease:
- Have you fainted recently?
- Do you feel dizzy?
- Do you feel dizzy or floaty when standing?
- Have you been experiencing cold sweats lately?
- Did you faint when you turned or moved your neck?
Treatment of Vasovagal Reflex
A doctor will usually first try to rule out more serious causes of fainting. Vasovagal reflex/syncope typically requires no further treatment. Avoiding triggers and staying hydrated can help. In rare cases, a pacemaker may be required.
Reviewed By:
Scott Nass, MD, MPA, FAAFP, AAHIVS (Primary Care)
Dr. Nass received dual medical degrees from the David Geffen School of Medicine at UCLA and Charles R. Drew University in Medicine and Science. He completed Family Medicine residency at Ventura County Medical Center with subsequent fellowships at Ventura, University of North Carolina-Chapel Hill, George Washington University, and University of California-Irvine. He holds faculty appointments at Keck School of Medicine of USC, Loma Linda University School of Medicine, and Western University of Health Sciences.
Tatsuya Shiraishi, MD (Cardiology)
Dr. Shiraishi graduated from the Kyoto University School of Medicine. He worked as a cardiologist at Edogawa Hospital, and after joining Ubie, he became the Director of East Nihonbashi Internal Medicine Clinic.
Content updated on Feb 19, 2025
Following the Medical Content Editorial Policy
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People with similar symptoms also use Ubie's symptom checker to find possible causes
- Feel anxiety suddenly
- Felt nauseous then fainted
- Sudden sweating
- Dizziness multiple times
- Sweating followed by fainting
- Fainting followed by a headache
- Off-balance like floating
- Fainting when walking
- Chest pain with fainting
- Cold sweats
- Spinning feeling
- Feeling faint before losing consciousness
- Confused or drowsy for a while after recovering consciousness
- A sense of motion or spinning (vertigo)
- Fainting when tired
See full list
Symptoms Related to Vasovagal Reflex
Diseases Related to Vasovagal Reflex
FAQs
Q.
Dizzy on Metoprolol Succinate? Why Your Heart Slows & Medically Approved Next Steps
A.
Dizziness on metoprolol succinate is usually due to a slower heart rate or lower blood pressure as your body adjusts, but severe or worsening symptoms like fainting, chest pain, severe shortness of breath, confusion, or a very slow pulse need urgent care. There are several factors to consider, and medically approved next steps include checking your heart rate and blood pressure, not stopping the drug suddenly, staying hydrated, standing up slowly, and reviewing your dose and other medications with your doctor. See the complete guidance below for important details that can change your next steps.
References:
* Mellin, C., Allemann, S. S., Widmer, M., Hersberger, K. E., & Arnet, I. (2019). Beta-Blockers and Dizziness in Older Adults: A Cross-Sectional Study. *Drugs & Aging*, *36*(2), 177-184.
* Epstein, A. E., & DiMarco, J. P. (2016). Management of Bradycardia in Patients with Cardiovascular Disease. *The Journal of Invasive Cardiology*, *28*(4), 133-140.
* Fedorowski, A., & Melander, O. (2019). Orthostatic Hypotension: JACC State-of-the-Art Review. *Journal of the American College of Cardiology*, *73*(25), 3326-3339.
* Stawny, M., Błasiak, J., & Stanicka, J. (2020). Metoprolol: An Updated Review of its Clinical Pharmacology and Therapeutic Use. *Current Drug Metabolism*, *21*(11), 844-862.
* Liang, W., Su, X., Ma, Y., Liu, D., Yu, J., Zhou, Y., & Wei, M. (2018). Adverse Drug Reactions of Beta-Blockers: Incidence, Mechanisms, and Management. *Current Vascular Pharmacology*, *16*(6), 570-580.
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Link to full study:
https://www.medrxiv.org/content/10.1101/2024.08.29.24312810v1References
Jardine DL, Wieling W, Brignole M, Lenders JWM, Sutton R, Stewart J (Year). The pathophysiology of the vasovagal response. Heart rhythm.
https://pubmed.ncbi.nlm.nih.gov/29246828/Alboni P, Alboni M (Year). Typical vasovagal syncope as a "defense mechanism" for the heart by contrasting sympathetic overactivity. Clinical autonomic research : official journal of the Clinical Autonomic Research Society.
https://pubmed.ncbi.nlm.nih.gov/28669087/Alboni P, Brignole M, Degli Uberti EC (Year). Is vasovagal syncope a disease? Europace : European pacing, arrhythmias, and cardiac electrophysiology : journal of the working groups on cardiac pacing, arrhythmias, and cardiac cellular electrophysiology of the European Society of Cardiology.
https://pubmed.ncbi.nlm.nih.gov/17272328/