Can Constipation Cause Nausea and Dizziness?
Medically reviewed by Andre Stone | MD, University of Pittsburgh School of Medicine on August 25th, 2026.
Constipation can cause nausea, while dizziness occurring alongside constipation may instead result from dehydration, medication effects, or another health problem. Constipation can sometimes occur with nausea, especially when it is severe. Dizziness is less clearly attributable to constipation itself and may instead be related to factors such as dehydration, medication effects, or another health problem. Prolonged stool retention can cause abdominal discomfort, bloating, and nausea, but lightheadedness may have a separate cause. Some people with chronic constipation also experience nausea. Not drinking enough fluid can contribute to dizziness and may worsen constipation in some people. Mild symptoms may improve when constipation resolves. However, severe or persistent constipation, repeated vomiting, marked abdominal pain or swelling, inability to pass gas, blood in the stool, fainting, or ongoing dizziness should be medically evaluated. Ask a clinician or pharmacist before using a laxative if symptoms are severe or the cause is unclear.
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