How can constipation cause dizziness?
Constipation can contribute to dizziness through several indirect mechanisms:
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Orthostatic Hypotension: When you are constipated, you might spend more time on the toilet, leading to prolonged sitting. Upon standing, blood can pool in your legs, reducing blood flow to the brain and causing dizziness or lightheadedness due to orthostatic hypotension1.
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Dehydration: Constipation can be associated with dehydration, especially if you are not drinking enough fluids. Dehydration can lead to symptoms like dizziness, lightheadedness, and fatigue35.
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Straining and Vagal Response: Straining during bowel movements can trigger a vagal response, leading to vasovagal syncope. This is a condition where the vagus nerve is overstimulated, causing a drop in heart rate and blood pressure, which can result in dizziness or fainting1.
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Fecal Impaction: In cases of severe constipation, fecal impaction can occur. This condition can cause symptoms such as abdominal pain, sweating, and dizziness due to the physical pressure and discomfort it causes24.
While constipation itself is not a direct cause of dizziness, these associated factors can contribute to feeling dizzy or lightheaded.