A female asked:
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i always get a nauseous feeling before and during bowel movements. this causes me to also have a racing heart and dizziness.

2 doctor answers
Dr. Ashesh Patel
24 years experience Internal Medicine
Drink more water!: You are describing a form of vaso-vagal syncope called defecation syncope in which the act of defecating causes the following symptoms: dizzy, lightheaded, palpitations, even passing out. It can be normal for some people to have this but can be caused by anemia, thyroid, heart problems etc. Drink more water to reduce symptoms. See your primary care physician to rule out any medical problems.
Answered on Jan 24, 2020
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1 comment
Dr. Susan Rhoads
37 years experience Family Medicine
Dr. Patel is absolutely correct. Also, avoid excess gas, bloating can cause vagal symptoms. Try generic simethicone with gassy foods. Avoid Splenda, sorbitol and jelly type candies. Don't get constipated, either. Do see your doc!
Jun 11, 2017
Dr. Mitchell Zeitler
38 years experience Anesthesiology
Get a checkup: Off the top of my head I would say that when you strain during a bowel movement , this may cause a vasalva which is physiogical response and causes your heart rate to drop and blood pressure will drop. Nausea accompanies sudden drops in blood pressure. Then your heart rate may return to normal or go faster. This does not explain the symptom of nausea prior to bowel moment you're straining.
Answered on Dec 3, 2019

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