How to Strengthen the Lower Esophageal Sphincter

The lower esophageal sphincter can be strengthened through a combination of targeted breathing exercises, lifestyle changes, and, in more severe cases, medical or surgical interventions. This muscular valve at the junction of your esophagus and stomach is not a single ring you can flex at will; it is a coordinated system involving smooth muscle and the surrounding diaphragm, and its tone is influenced by everything from your body weight to what you ate for dinner. The encouraging news is that several of these influences are modifiable, and research supports specific strategies for improving sphincter function.

What the Lower Esophageal Sphincter Actually Does

Your LES is a zone of smooth muscle roughly four to five centimeters long, with about two centimeters of it sitting below the diaphragm inside the abdomen.¹ It works in partnership with the crural diaphragm, a band of skeletal muscle that wraps around the upper half of the sphincter and squeezes it shut every time you breathe in.² That dual-muscle design matters because it means two separate systems contribute to keeping acid where it belongs, and strengthening either one can help.

Most reflux episodes in both healthy people and those with GERD are caused by transient lower esophageal sphincter relaxations, or TLESRs. These are brief openings of the sphincter that are not triggered by swallowing and last much longer than the relaxation that occurs when you swallow food.³ Any strategy that reduces the frequency of these relaxations or increases baseline sphincter pressure works in your favor.

Diaphragmatic Breathing and Inspiratory Muscle Training

Because the crural diaphragm physically wraps around the LES, training it can tighten the anti-reflux barrier. Diaphragmatic (or “belly”) breathing exercises have been studied directly in GERD patients. In one comparative trial, patients assigned to a diaphragmatic breathing program saw a significant increase in LES pressure, while those assigned to aerobic exercise alone showed no change.⁴ A separate randomized trial found that participants performing abdominal breathing exercises used far less acid-suppressing medication over a four-week period compared with controls who did not practice the exercises.⁵

A more structured approach uses an inspiratory muscle training (IMT) device, the kind of handheld gadget that provides resistance when you inhale. In GERD patients, an IMT program increased average pressure at the esophago-gastric junction by roughly half, and the pressure generated during deep inhalation rose even more steeply.⁶ Interestingly, another trial found that even a low-resistance “sham” training group experienced some pressure increase, suggesting that simply practicing sustained, focused breathing against any resistance may recruit the crural diaphragm enough to help.⁷ That is good news if you do not own a training device: deliberate, deep diaphragmatic breathing practiced daily appears to have a real effect.

Why Weight Loss Matters More Than You Might Think

Excess body weight does not just push on your stomach mechanically. It changes how the sphincter behaves at a physiological level. A study that compared normal-weight, overweight, and obese individuals found that after a meal, obese subjects had roughly three and a half times the rate of transient sphincter relaxations as normal-weight controls. The proportion of those relaxations that came with acid reflux was dramatically higher too: about 64% in the obese group versus about 18% in normal-weight participants.⁸ The correlation between BMI and the number of reflux-associated sphincter relaxations was strong, and waist circumference tracked even more tightly with reflux events. This means that losing weight, and in particular losing abdominal fat, directly reduces the mechanical and hormonal forces that pry the sphincter open after meals.

Dietary Triggers That Weaken the Sphincter

Two of the most studied dietary culprits are fat and caffeine. Fat in a meal triggers the release of a gut hormone called cholecystokinin (CCK), and CCK relaxes the LES. Research has shown that long-chain fats, the kind found in most cooking oils and animal fats, lower sphincter pressure through this CCK pathway. Even medium-chain fats, like those in coconut oil, reduce LES pressure through a separate mechanism that does not involve CCK.⁹ In practical terms, a high-fat meal is a double hit: it slows stomach emptying and relaxes the valve at the top. Smaller, lower-fat meals are one of the simplest changes you can make.

Caffeine is the other reliably studied offender. In a controlled study, a dose of caffeine equivalent to a couple of strong cups of coffee significantly lowered baseline LES pressure within ten minutes and kept it suppressed for at least 25 minutes.¹⁰ If you are chasing every possible advantage for your sphincter, reducing caffeine is worth trying, though sensitivity varies from person to person. Alcohol and chocolate are commonly cited triggers as well, though the evidence on those is less mechanistically precise than for fat and caffeine.

Quitting Smoking and Nicotine

Nicotine relaxes the LES regardless of how it enters your body. In a study using nicotine patches on healthy nonsmokers, sphincter pressure dropped by about 30% within twelve hours of patch application.¹¹ That finding matters because it means the effect is not just from smoke irritating the esophagus; nicotine itself suppresses the muscle. Smokers as a group have consistently lower sphincter pressure than nonsmokers, and research suggests that smoking also directly provokes acid reflux episodes beyond what the lower baseline pressure alone would predict.¹² Acutely smoking a cigarette reduced sphincter pressure by about 20% in both symptomatic and asymptomatic subjects in another study.¹³ If you vape or use nicotine pouches and assume you have dodged the reflux problem, the patch study suggests otherwise. Nicotine in any form is working against your sphincter.

Sleep Position and Head-of-Bed Elevation

Gravity is a free tool. Raising the head of your bed reduces overnight acid exposure and speeds the clearance of any acid that does reach your esophagus.¹⁴ This does not mean propping yourself up on pillows, which tends to bend you at the waist and can increase abdominal pressure. A wedge under the mattress or blocks under the bed frame keeps your whole torso on an incline.

Side matters as well. Sleeping on your left side produces markedly less acid exposure in the esophagus than sleeping on your right side or on your back. In one study using simultaneous monitoring of body position and esophageal pH, left-side sleepers had nearly zero median acid exposure time, while right-side and supine sleepers had measurably higher exposure. Acid clearance time was also roughly half as long on the left side compared with the right.¹⁵ The anatomy explains this: when you lie on your left, the stomach hangs below the esophageal junction, and any pooled acid sits away from the sphincter. On your right, the stomach drapes over the junction, making reflux almost inevitable.

Exercise Intensity and Reflux

Moderate physical activity is broadly good for GERD through its effect on weight and overall motility, but intense exercise can temporarily make reflux worse. Studies in both trained athletes and untrained individuals found that as exercise approached maximum effort, esophageal contractions weakened and reflux episodes increased significantly.¹⁶ ¹⁷ The effect is intensity-dependent: moderate effort is generally fine, but high-intensity running or heavy lifting on a full stomach can provoke reflux even in people who do not normally have it. Timing meals well before hard workouts and favoring upright activities over ones that bend you forward (like certain core exercises) can minimize the problem.

Medications That Quietly Weaken the Sphincter

Several common drug classes lower LES pressure as a side effect you may never have been told about. These include benzodiazepines (used for anxiety and sleep), calcium channel blockers (prescribed for blood pressure), nitrates (used for chest pain), beta-2 agonists (in many asthma inhalers), and theophylline-type drugs.¹⁸ ¹⁹ If you take any of these and have worsening reflux, it is worth discussing alternatives with your prescriber. Stopping a medication is not always possible, but sometimes switching to a different drug in the same class or adjusting the dose can make a difference.

Alginate-Based Remedies

Over-the-counter alginate products (sold under brand names like Gaviscon in some markets) take a different approach. Rather than reducing acid production or strengthening the sphincter itself, they form a floating gel “raft” on top of your stomach contents. When reflux does occur, the raft moves into the esophagus ahead of the acid, acting as a physical barrier.²⁰ The gel forms when the alginate reacts with stomach acid, and bicarbonate in the formulation generates carbon dioxide gas that keeps the raft buoyant.²¹ Alginates do not treat the root cause of a weak sphincter, but they can provide relief while you work on the lifestyle measures that do. They are considered safe for most people, including during pregnancy, which makes them a useful bridge.

Baclofen and Pharmacological Sphincter Support

For people whose reflux is driven primarily by frequent transient sphincter relaxations that do not respond to acid-suppressing drugs, there is a pharmacological option that targets the sphincter more directly. Baclofen, a muscle-relaxant drug normally used for spasticity, acts on receptors in the brainstem pathway that triggers those transient relaxations. Studies have shown that baclofen reduces these relaxation events by roughly 30 to 40% and decreases acid reflux episodes along with them.²² ²³ The catch is that baclofen crosses into the brain and can cause drowsiness and dizziness, which limits its practical usefulness for many patients. Researchers have been developing newer drugs that act on the same receptor pathway with fewer central side effects, though none has yet become widely available for GERD.

Surgical and Device-Based Options

When lifestyle modifications, breathing exercises, and medications are not enough, surgical reinforcement of the sphincter is the most definitive option. The Nissen fundoplication, in which the top of the stomach is wrapped around the lower esophagus, restores both the length and the pressure of the sphincter by tightening the crural diaphragm and creating a physical wrap that acts like a one-way valve.²⁴ This procedure has been the gold standard for decades and restores sphincter function to near-normal levels in most patients.²⁵

A newer alternative is magnetic sphincter augmentation, in which a bracelet of small magnetic beads is placed around the outside of the LES. The beads hold the sphincter closed at rest but separate to allow food through when you swallow. Studies show that this device increases both resting LES pressure and the functional length of the sphincter, including the portion sitting within the abdomen.²⁶ The outflow resistance imposed by the device, essentially how hard the stomach contents have to push to get through, also increases significantly after placement.²⁷ This option is less invasive than a full fundoplication and preserves the ability to belch and vomit, which some fundoplication patients struggle with. Not everyone is a candidate; people with large hiatal hernias or severe esophageal motility disorders usually need the traditional wrap instead.

An endoscopic procedure called Stretta delivers radiofrequency energy to the sphincter area. It does not dramatically increase LES pressure the way surgery does, but it appears to reduce the sensitivity of the esophagus to acid and decrease the volume of refluxate that reaches the esophagus, providing symptom relief for some patients.²⁸ It occupies a middle ground between lifestyle measures and surgery, and is sometimes offered to patients who want to avoid both long-term medication and a surgical procedure.

How Pregnancy and Hormones Affect the Sphincter

If you are pregnant and dealing with worsening reflux, the explanation is hormonal rather than structural. Rising progesterone and estrogen levels during pregnancy reduce the LES’s ability to respond to the signals that normally tighten it. Research from early pregnancy shows that while baseline sphincter pressure can still be normal, the muscle’s responses to stimulation are already blunted.²⁹ As pregnancy progresses, the combination of rising hormones and increasing abdominal pressure from the growing uterus causes sphincter pressure to drop further, which is why heartburn tends to get worse through the second and third trimesters.³⁰ The good news is that this effect reverses after delivery. In the meantime, the positional strategies (left-side sleeping, bed elevation) and alginate products are the safest interventions.

The Role of Saliva and Esophageal Clearance

Strengthening the sphincter is only half the equation. Even a well-functioning LES lets some acid through occasionally, and your body has a cleanup mechanism: peristaltic waves triggered by swallowing push refluxed material back down, and saliva, which contains bicarbonate, neutralizes residual acid clinging to the esophageal lining.³¹ Anything that dries out your mouth, whether it is medication, mouth breathing during sleep, or dehydration, impairs this secondary defense. Chewing sugar-free gum after meals is one of the simplest ways to boost saliva flow and speed acid clearance. It will not fix a fundamentally weak sphincter, but it meaningfully reduces the damage that stray acid can do.

Melatonin has also drawn some research interest in this area. One line of investigation suggests that melatonin may reduce gastric acid secretion and stimulate the release of gastrin, a hormone that promotes LES contraction.³² The evidence here is still preliminary and largely based on animal models, so melatonin is not a proven treatment. But for people who already take it for sleep and happen to have nighttime reflux, it is an intriguing overlap worth watching as more data emerge.