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 Jan 19, 2024
Following the Medical Content Editorial Policy
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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!
With a free 3-min Vasovagal Reflex quiz, powered by Ubie's AI and doctors, find possible causes of your symptoms.
This questionnaire is customized to your situation and symptoms, including the following personal information:
Biological Sex - helps us provide relevant suggestions for male vs. female conditions.
Age - adjusts our guidance based on any age-related health factors.
History - considers past illnesses, surgeries, family history, and lifestyle choices.
Your symptoms
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Your report
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✔ When to see a doctor
✔︎ What causes your symptoms
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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.
Your doctor may ask these questions to check for this disease:
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.
Q.
What Causes a Vagal Response While on the Toilet?
A.
A vagal reaction while on the toilet, often leading to defecation syncope (fainting), is typically caused by straining during bowel movements, which triggers the vagus nerve. This can lead to a sudden drop in blood pressure and heart rate.
References:
Bae MH, Kang JK, Kim NY, Choi WS, Kim KH, Park SH, Lee JH, Yang DH, Park HS, Cho Y, Chae SC, Jun JE. Clinical characteristics of defecation and micturition syncope compared with common vasovagal syncope. Pacing Clin Electrophysiol. 2012 Mar;35(3):341-7. doi: 10.1111/j.1540-8159.2011.03290.x. Epub 2011 Dec 21. PMID: 22188510.
Tigga MP. An Unusual Case of Defecation Syncope. J Midlife Health. 2019 Apr-Jun;10(2):99-100. doi: 10.4103/jmh.JMH_2_19. PMID: 31391761; PMCID: PMC6643707.
Aydin MA, Salukhe TV, Wilke I, Willems S. Management and therapy of vasovagal syncope: A review. World J Cardiol. 2010 Oct 26;2(10):308-15. doi: 10.4330/wjc.v2.i10.308. PMID: 21160608; PMCID: PMC2998831.
Cai W, Kang H, Hai T. Vasovagal reflex emergency caused by Riedel's thyroiditis: A case report and review of the literature. Asian J Surg. 2016 Jan;39(1):41-4. doi: 10.1016/j.asjsur.2013.01.008. Epub 2013 May 3. PMID: 23644007.
https://www.sciencedirect.com/science/article/pii/S1015958413000092?via%3DihubMale, 30s
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My experience was great. I was worried, but the symptom checker helped me narrow down what it might be. I feel a little relieved compared to when I first started, and it gives me a starting point for what my symptoms could mean.
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The questions asked and possible causes seemed spot on, putting me at ease for a next-step solution.
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Female, 40s
I was actually very impressed with the results it provided because, although I didn’t mention it during the questionnaire because I thought it was unrelated, it suggested I may have something I’ve actually been diagnosed with in the past.
(Sep 25, 2024)
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.
Our symptom checker AI is continuously refined with input from experienced physicians, empowering them to make more accurate diagnoses.
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Ubie’s symptom checker demonstrated a Top-10 hit accuracy of 71.6%, surpassing the performance of several leading symptom checkers in the market, which averaged around 60% accuracy in similar assessments.
Link to full study:
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