How to Get Gas Out of Your Shoulder & What Causes It

Shoulder pain caused by trapped gas is one of the most common complaints after laparoscopic surgery, affecting roughly one in five patients. The pain is not actually coming from gas sitting inside your shoulder joint. It is referred pain, caused by carbon dioxide gas left over from surgery pressing against your diaphragm and irritating the phrenic nerve, which shares sensory pathways with your shoulder. The good news is that the pain is almost always temporary, usually lasting a couple of days, and several straightforward strategies can speed up relief.

Why Laparoscopic Surgery Puts Gas in Your Abdomen

During laparoscopic procedures, surgeons inflate your abdominal cavity with carbon dioxide gas to create a working space for their instruments. This is called a pneumoperitoneum. The gas gives the surgeon visibility and room to operate through small incisions instead of one large one. Some of that CO2 gets absorbed into your bloodstream and is exhaled through your lungs. Research measuring CO2 elimination during laparoscopic procedures found that the absorbed gas increased CO2 output through the lungs by about 30% during insufflation.¹ After the instruments are removed, the surgeon tries to release as much residual gas as possible, but it is virtually impossible to get all of it out. That leftover pocket of CO2 is what causes the trouble.

How Leftover CO2 Causes Shoulder Pain

The residual gas rises to the highest point in your abdominal cavity, which, when you are lying flat on your back, is right underneath the diaphragm. The gas stretches and irritates the diaphragm’s peritoneal lining, which is served by the phrenic nerve. Because the phrenic nerve originates from the same spinal cord segments (C3 through C5) that supply sensation to the shoulder area, your brain interprets the irritation as shoulder pain. Early research identified this mechanism as the most likely cause of what was called the “post-laparoscopic pain syndrome,” pointing specifically to the volume of remaining gas acting on the phrenic nerve.²

The pain can range from a dull ache to a sharp, stabbing sensation, and it tends to be worse in one shoulder, often the right, though it can affect both. In a study of 337 patients who underwent laparoscopic surgery, shoulder pain was present in about 22% of them, and the average duration was roughly two days.³ For most people, the intensity is low to moderate, but for an unlucky minority, it can be more painful than the surgical incision sites themselves.

What You Can Do at Home to Get Relief

If you are reading this in bed after surgery, here are the practical things that help. None of them are complicated, but they work for different reasons.

Move around gently: Walking is one of the most effective things you can do. Even slow laps around your house help shift the gas pocket away from the diaphragm and encourage your body to absorb and expel the remaining CO2 through normal breathing. The sooner you are upright and moving after surgery, the faster the gas dissipates.
Try lying on your left side: If walking is too painful, lying on your left side with your knees drawn up slightly can help redistribute gas away from the right diaphragm, which is often where the irritation is worst. Some people find that changing positions every 15 to 20 minutes provides more relief than staying in one spot.
Apply heat: A warm compress or heating pad on your shoulder can ease the muscle tension and discomfort caused by the referred pain. A trial comparing warm CO2 insufflation with local heat application after laparoscopic cholecystectomy found that both heat-based methods lowered shoulder pain scores compared to control groups, suggesting warmth plays a genuine role in managing the discomfort.⁴
Use peppermint: This one sounds like folklore, but there is some supporting evidence. Peppermint has been shown to speed up bowel motility after abdominal surgery, and faster gut movement helps push residual gas through and out of the body. In a trial following cesarean sections, women given peppermint drops passed gas significantly sooner than those given a placebo.
Take over-the-counter pain relief: Standard anti-inflammatory drugs like ibuprofen or diclofenac are the first-line choice for post-laparoscopic pain. They address the inflammatory component of phrenic nerve irritation directly. Check with your surgical team about what is safe to combine with any medications you were sent home with.

One thing that does not help as much as people expect: simethicone (Gas-X). Simethicone works by breaking up gas bubbles in your digestive tract, and the gas causing your shoulder pain is not in your digestive tract. It is free CO2 trapped in the peritoneal cavity, outside the intestines entirely. Simethicone is fine to take for any bloating or intestinal gas you also have after surgery, but it will not address the shoulder pain specifically.

The Trendelenburg Position and Why Results Are Mixed

You may come across advice to lie with your head lower than your feet, a position called Trendelenburg, to help gas move away from the diaphragm. The idea makes intuitive sense: tilt gravity so the gas pocket shifts toward your pelvis instead of pressing on your diaphragm. Some hospitals use this technique in the recovery room, and the evidence is genuinely mixed.

A randomized trial of gynecological laparoscopy patients found that a 20-degree Trendelenburg position after surgery significantly reduced shoulder pain at every time point measured, with the intervention group reporting pain scores roughly half those of the control group at 6 hours and even lower at 12 and 24 hours.⁵ A separate trial in cholecystectomy patients also found significantly lower pain at 6, 12, 24, and 48 hours when patients were placed in a 30-degree Trendelenburg position for 30 minutes after awakening.⁶

However, a trial of post-hysterectomy patients who were kept in a modified Trendelenburg position for six hours found no significant benefit.⁷ The inconsistency likely comes down to differences in the angle used, the duration, the type of surgery, and how much residual gas was present. A brief period of head-down positioning shortly after surgery, for something like 20 to 30 minutes, seems more promising than prolonged positioning. At home, you can approximate this by lying flat and propping your hips up on a couple of pillows, though comfort matters and you should not force yourself into a position that makes you feel worse overall.

What Surgeons Can Do During the Procedure to Prevent It

If you have not had your surgery yet and are trying to prepare, or if you are a repeat laparoscopy patient who remembers the shoulder pain vividly, it is worth knowing that several intraoperative techniques can reduce the problem. These are decisions your surgical and anesthesia team make, but you can ask about them.

Pulmonary Recruitment Maneuver

At the end of surgery, the anesthesiologist can perform what is called a pulmonary recruitment maneuver: a series of deep, sustained positive-pressure breaths delivered through the ventilator before you wake up. This does two things. It reinflates collapsed portions of the lungs, and the resulting downward push of the diaphragm physically squeezes residual CO2 out of the abdominal cavity through the trocar ports, which are still open at that point.⁸ A randomized trial found that even a moderate-pressure recruitment maneuver (at 40 cmH2O) was effective at removing residual gas and reducing shoulder pain.⁹ When combined with instilling a local anesthetic into the abdominal cavity, the results were even better. A trial that tested bupivacaine plus a recruitment maneuver against saline plus a recruitment maneuver found that the combined approach kept pain scores near zero at both 4 and 24 hours after surgery.¹⁰

Low-Pressure Pneumoperitoneum

The standard inflation pressure during laparoscopic surgery is around 12 to 15 mmHg. Using a lower pressure, typically 8 to 10 mmHg, means less total CO2 is pumped into your abdomen and less residual gas remains afterward. In one trial comparing the two pressures for gallbladder removal, shoulder pain occurred in half the standard-pressure patients but only about 18% of the low-pressure group, and analgesic requirements dropped substantially.¹¹ Earlier trials showed similar results, with the low-pressure group experiencing significantly less shoulder pain at 12 and 24 hours and needing less pain medication.¹² The tradeoff is that lower pressure gives the surgeon a slightly smaller working space, so this approach works best for straightforward cases where the surgeon does not need maximum visibility.

Warmed and Humidified Gas

Standard CO2 from a gas cylinder is cold and bone-dry. Warming it to body temperature and adding moisture before insufflation appears to reduce the irritation it causes to the peritoneal lining. A multi-arm randomized trial of gynecologic laparoscopy patients found that warmed and humidified gas led to significantly less pain in the recovery room compared to standard cold, dry gas.¹³ A separate double-blinded trial confirmed that shoulder pain at 6 hours was significantly reduced in the heated and humidified group.¹⁴ Not every hospital has the specialized insufflation equipment for this, but it is becoming more common as part of enhanced recovery protocols.

How Long the Pain Lasts and When to Worry

For the majority of people, post-laparoscopic shoulder pain peaks within the first 24 hours and fades significantly by 48 hours. The study of 337 laparoscopic patients found the average duration was about two days.³ By the time you are a week out from surgery, gas-related shoulder pain should be gone. If it persists beyond that, the pain is likely coming from something else: posture changes during recovery, muscle guarding, or an unrelated shoulder issue that became noticeable when you were already uncomfortable and paying close attention to your body.

There are a few red flags worth knowing. If your shoulder pain is accompanied by rapidly worsening swelling in your neck, chest, or arm, especially with a crackling sensation under the skin, that could indicate subcutaneous emphysema, where gas has tracked into the soft tissues. This is rare after abdominal laparoscopy but is a recognized complication of shoulder arthroscopy, where irrigation fluid under pressure can force air into tissue planes.¹⁵ Contact your surgeon or go to an emergency department if you notice crepitus (that crackling feeling), progressive swelling, difficulty breathing, or fever alongside shoulder pain.

Factors That Increase Your Risk

Not everyone who has laparoscopic surgery gets shoulder pain, and certain factors make it more likely. Longer operations tend to produce more pain, which makes sense because more gas is used and more CO2 has time to be absorbed into the peritoneal tissues. The same study of 337 patients found that the operative time threshold at which shoulder pain began to appear was around 35 minutes.³ Operations that use extraperitoneal approaches, where the gas is insufflated outside the peritoneal lining rather than inside it, are associated with greater CO2 absorption, because the tissue outside the peritoneum absorbs gas more readily.¹⁶

Women appear to be affected slightly more often, which may partly reflect the types of laparoscopic surgeries that are more commonly performed on women (gynecologic procedures that often require steep patient positioning). Patients who have had prior abdominal surgeries sometimes report more pain, possibly because adhesions change how gas distributes in the abdominal cavity. But none of these risk factors are strong enough that you should expect to have a problem or avoid a necessary procedure because of them. The pain is manageable and self-limiting.

Shoulder Gas and Pain Outside of Laparoscopy

Though laparoscopic surgery is by far the most common reason people search for help with gas in the shoulder, it is not the only context. Shoulder arthroscopy, a minimally invasive procedure where fluid is pumped into the shoulder joint under pressure, can occasionally cause fluid and air to track into surrounding tissues. A systematic review of fluid extravasation in shoulder arthroscopy found that chest wall swelling and neck swelling were the most common signs, and while most cases resolved with observation alone, some required airway management or other interventions.

Entirely separate from surgical causes, some people experience referred shoulder pain from gastrointestinal issues, like a distended stomach or trapped gas in the splenic flexure of the colon, which sits high in the left abdomen near the diaphragm. This is sometimes called the “splenic flexure syndrome” and can cause left shoulder pain that is easily confused with cardiac or musculoskeletal problems. Walking, gentle movement, and over-the-counter gas relief (simethicone is actually appropriate here, since the gas is in the intestine) tend to help with this version of the problem.

In extremely rare cases, gas within or around the shoulder itself can indicate a serious infection. Gas gangrene, caused by anaerobic bacteria like Clostridium species, produces gas within infected tissues and is a surgical emergency. This is not something that happens out of the blue in healthy people. It is associated with deep wounds, compromised immune systems, or underlying malignancies. If your shoulder is red, hot, rapidly swelling, and you feel systemically unwell with fever, that demands immediate emergency evaluation regardless of recent surgical history.

What Happens to the Gas Your Body Absorbs

A detail that reassures many patients is understanding where the CO2 actually goes. Your body is already equipped to handle carbon dioxide because it is a normal byproduct of metabolism. The CO2 that gets absorbed through the peritoneal membrane enters the bloodstream, travels to the lungs, and is simply breathed out. Research using isotope-labeled CO2 measured this process directly in patients during laparoscopy and found that absorbed gas accounted for roughly 15% of expired CO2 after 30 minutes of insufflation, and that the proportion dropped rapidly once the gas was turned off.¹⁷ Your body clears it efficiently. The problem is not the absorbed gas. It is the residual pocket of free gas that sits against your diaphragm and takes longer to dissipate because it has to be absorbed gradually rather than vented directly.

This is also why deep breathing exercises, recommended by many post-surgical recovery programs, actually help. Each deep breath increases the pressure gradient that drives CO2 from the peritoneal cavity into the bloodstream and then out through the lungs. You are not just stretching your diaphragm away from the gas pocket; you are actively speeding up the absorption and elimination process. Even five to ten minutes of slow, deliberate deep breathing every hour can make a noticeable difference, especially in the first 24 hours when the gas pocket is largest.