Can Constipation Cause Nausea and Dizziness?

Yes, constipation can cause nausea and dizziness through several mechanisms. When stool builds up in the colon, it can trigger vagal nerve stimulation, leading to nausea and sometimes vomiting. The increased abdominal pressure from severe constipation can also affect blood circulation and contribute to dizziness. Additionally, toxins from prolonged stool retention may be reabsorbed into the bloodstream, causing systemic symptoms including lightheadedness. Studies show that up to 40% of people with chronic constipation experience associated nausea. Dehydration from straining or reduced fluid intake can worsen both constipation and dizziness. These symptoms typically improve once normal bowel movements resume through dietary changes, increased fiber intake, or appropriate laxatives.

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