The stomach sits below the diaphragm, curving toward the left upper abdomen.
When you lie on your left side:
The junction between your esophagus and stomach (the lower esophageal sphincter) stays above the level of stomach contents
This makes it harder for acid to splash upward
In contrast, lying on the right side:
Positions the stomach higher than the esophagus
Creates a slope that encourages acid to flow back up
 A 2005 study published in The American Journal of Gastroenterology found:
Participants experienced significantly less acid exposure during sleep when lying on the left side vs. the right.
 For many patients, this simple switch reduces nighttime heartburn — without medication.
2. Supports Natural Stomach Anatomy
The shape of the stomach follows a J-curve, with the top (fundus) on the left.
Sleeping on the left side:
Allows food and gas to move more naturally through the digestive tract
May improve gastric emptying in some individuals
While evidence is limited, many patients report feeling lighter and less bloated when they adopt this position.
3. May Aid Lymphatic Drainage
The thoracic duct — the main vessel of your lymphatic system — runs along the left side of your body.
Lying on your left side may:
Use gravity to support lymph fluid movement
Help clear metabolic waste more efficiently
 Especially relevant after illness or surgery — though more research is needed.
4. Improves Pancreatic & Gallbladder Function (Theoretically)
These organs drain into the small intestine via ducts influenced by gravity.
Though not definitively proven, some experts suggest:
Left-side sleeping may reduce pressure on the pancreatic duct
Promote smoother bile release from the gallbladder
 Still theoretical — but plausible based on anatomy.
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