Why Does My Stomach Hurt When I Lie Down?

Stomach pain when lying down typically results from acid reflux, where stomach acid flows back into the esophagus due to gravity changes. The horizontal position reduces the natural downward flow of digestive contents, allowing acid to travel upward more easily. This affects approximately 20% of adults in Western countries. Other causes include delayed gastric emptying, hiatal hernia, or eating large meals within 2-3 hours of bedtime. The pain often worsens when lying flat and may improve when sitting upright or elevating your head with pillows. If symptoms persist for more than two weeks or occur nightly, consult a healthcare provider to rule out underlying conditions like GERD or gastritis.

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