That is an exaggeration.
The relationship between sleeping position and reflux is much more specific.
5. Could it cause ulcers?
Peptic ulcers are sores that develop in the lining of the stomach or the upper part of the small intestine.
Two major causes are infection with Helicobacter pylori and the use of certain anti-inflammatory medications, including ibuprofen and aspirin.
Sleeping on the right side is not an established cause of peptic ulcers.
People who experience recurring stomach pain should not assume that changing their sleeping position will treat an ulcer.
Persistent or severe symptoms deserve medical assessment.
6. Does the right side affect everyone in the same way?
No.
People have different anatomical characteristics, medical histories, and sleep habits.
Someone without GERD may experience no digestive discomfort when sleeping on the right side.
Someone with significant nighttime reflux may notice a clear difference when changing to the left.
There are also individuals who cannot comfortably remain on their left side because of shoulder pain, hip problems, or other medical conditions.
The American Heart Association notes that sleep-position research is limited in several areas and that the best position can depend on a person's health circumstances. People with heart failure, for example, may find left-side sleeping uncomfortable because it can worsen their sensation of breathlessness.
The key message is not that right-side sleeping is dangerous.
It is that people with frequent nighttime reflux may benefit from understanding how their body position influences their symptoms.
Recognizing this difference helps prevent unnecessary fear while making room for practical improvements.
Chapter 4: Who Should Pay Particular Attention to Their Sleeping Position?
Although the left-side position may help reduce nighttime reflux, its potential benefits are especially relevant to certain groups of people.
Understanding who may benefit can help individuals make practical adjustments without assuming that one sleeping position is perfect for everyone.
1. People who regularly experience acid reflux
People diagnosed with GERD may be particularly sensitive to their sleeping position.
Common symptoms include:
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Burning sensations in the chest after meals.
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Sour or bitter fluid rising into the throat.
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Frequent nighttime burping.
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A persistent feeling of irritation in the throat.
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Coughing that becomes worse when lying down.
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Waking up with an unpleasant taste in the mouth.
For these individuals, sleeping on the left side may help reduce nighttime acid exposure.
It can be especially useful when combined with other lifestyle adjustments.
For example, avoiding food for two to three hours before bedtime may reduce the likelihood of reflux during the night.
Eating smaller evening meals may also help people who experience discomfort after eating large portions.
2. People who eat dinner late at night
Late-night eating is another habit worth reconsidering.
After a meal, the stomach needs time to process food.
Going to bed immediately after eating means spending several hours in a horizontal position while digestion is still underway.
For people prone to reflux, this can increase discomfort.
A practical approach is to finish eating at least two to three hours before lying down.
The American College of Gastroenterology includes avoiding meals shortly before bedtime among its recommendations for managing GERD.
PubMed Central (PMC)
This does not mean that everyone must follow an identical dinner schedule.
People who work night shifts or have unusual routines may need different arrangements.
The important principle is allowing sufficient time between a substantial meal and bedtime.
3. Pregnant women experiencing heartburn
Pregnancy can change how the digestive system functions.
Hormonal changes may relax the lower esophageal sphincter, making reflux more likely.
As pregnancy progresses, the growing uterus can also increase pressure within the abdomen.
Consequently, many pregnant women experience heartburn, particularly during the later stages of pregnancy.
Sleeping on the left side may help some pregnant women who experience reflux.
However, pregnancy has another important consideration: sleep safety.
As pregnancy advances, especially from 28 weeks onward, healthcare guidance generally recommends going to sleep on either side rather than deliberately settling onto the back.
Both the left and right sides are acceptable.
There is no need to panic if someone wakes up on their back. The recommended approach is simply to turn onto either side and return to sleep.
The left side is not an absolute requirement for every pregnant woman.
Women who experience persistent heartburn, severe discomfort, or other pregnancy-related symptoms should discuss appropriate management with their maternity care team.
4. People who experience nighttime coughing
Nighttime coughing can have many possible causes.
These include asthma, respiratory infections, allergies, postnasal drip, and gastroesophageal reflux.
When reflux is responsible, stomach contents may irritate the esophagus and sometimes reach the throat.
Some individuals notice that coughing becomes worse after lying down.
Left-side sleeping and raising the upper body may help certain people with reflux-related symptoms.
However, persistent coughing should not automatically be attributed to stomach acid.
A healthcare professional can help investigate the actual cause.
5. People who have difficulty sleeping comfortably
Sleep position also affects pressure on muscles, joints, and the spine.
Some individuals find side sleeping more comfortable because it reduces pressure on their lower back.
Others experience shoulder pain or hip discomfort when lying on one side for too long.
The best position should support the body without creating unnecessary pressure.
A supportive pillow between the knees may help maintain a more comfortable alignment for side sleepers.
A pillow that supports the head and neck at an appropriate height can also reduce strain.
People with chronic pain or mobility limitations may need individualized advice.
6. People with certain heart conditions
One common misconception is that sleeping on the right side is harmful to the heart.
There is not enough evidence to make such a general claim.
In fact, some people with heart failure prefer sleeping on their right side because lying on the left can make them feel more breathless or uncomfortable.
This is one reason sleeping-position advice should take existing medical conditions into account.
Anyone with heart disease, unexplained breathlessness, chest discomfort, or worsening nighttime symptoms should discuss sleep positioning with their healthcare professional.