Flatulence or Passing Gas After Surgery

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It is a strange fact that doctors and nurses may seem very concerned about your ability to “pass gas” after surgery, which is typically a pretty personal part of day-to-day life. There is a good answer for all of the concern about your ability to release gas after having anesthesia.

When you are recovering in the post-anesthesia care unit (PACU), you may be told to notify your nurse if you pass gas. In the pediatric setting, a child may be told that the nurse would like to know if they “toot” or “fart”, which may cause some giggles or shyness. 

Why all of this focus on passing gas? It's rather simple really, it means you aren't developing a post-operative ileus (POI), a potentially serious condition.

Woman at the hospital passing gas after surgery.

Brianna Gilmartin / Verywell

Significance of Gas After Surgery

After surgery, or more specifically, after the medications that are given during surgery, it is possible that a complication called a postoperative ileus (POI) may develop. This is a delay in gastric motility—the medical way of saying the movements of your gut that move things from your stomach through the digestive tract.

A postoperative ileus means that it takes your intestines longer to wake up from anesthesia than the rest of you. The severity can range from a barely noticeable slowing of how you process food to a serious complication that requires significant medical treatment.

The ability to pass gas is a clear sign that your gastrointestinal tract is waking up and that POI was never there or is improving.

This is why nurses and doctors care about whether or not you pass gas in the hours after surgery. It is a sign that your digestive organs are returning to their normal state.

For some surgeries, the patient performs a bowel preparation prior to the procedure, which cleans the stool from the intestines. For these patients, it may be several days before they have a stool, so passing gas is one of the earliest signs of their intestines waking up.

In the case of outpatient surgery, passing gas may be required before you are able to go home. The staff doesn’t want to send you home with a potentially serious complication, so don’t even think about being bashful, let them know if you have successfully passed gas.


For most patients, the delay in gastric motility is brief, but for others, the complication requires a longer hospital stay than intended. For those patients, the symptoms of an ileus may be much more severe.

  • Nausea
  • Bloating
  • Vomiting
  • Abdominal tenderness or pain
  • Passing gas/stool is delayed or not possible


Researchers do not agree on why postoperative ileus happens. One theory is that the sympathetic nervous system, which normally decreases the amount of movement done by the intestines, temporarily has greater control over the intestines than the parasympathetic nervous system, which increases the movement of the intestines. 

Another theory suggests that POI is caused during abdominal procedures by manipulating the intestines during surgery, such as moving them out of the way to reach other body structures or performing surgery directly on them.

This starts a cascade effect in which the white blood cells in the intestine are stimulated by the surgical activity and trigger other types of cells to move to the area. Other theories point to electrolyte imbalances and the use of opioids for pain control. 

The likely answer is that the POI can be caused by more than one issue, and each individual is uniquely affected by these factors. One person may be able to take pain medication without difficulty and another will experience severe constipation and an ileus when taking pain medication.

Risk Factors

Patients who have surgery that requires manipulation of the intestines or surgery performed on the intestines are at higher risk of developing postoperative ileus. The severity of POI may also be increased in these patients.

Patients receiving opioid medications for pain relief are also at a higher risk of developing POI, as are patients who already have issues with their intestines.


While preventing postoperative ileus may not entirely be possible, there are ways to minimize the risk. Patients receiving epidural anesthesia rather than general anesthesia typically have a quicker recovery from this complication. Generally speaking, lighter anesthesias will result in a lower likelihood of POI.

Minimally invasive techniques also may decrease the duration of postoperative ileus when compared to the more traditional surgical techniques. Less time under anesthesia and a smaller impact on the body may be the logical reason why minimally invasive surgeries lead to less POI in the recovery phase.

One of the simplest solutions, which is showing promise in research studies, may be to chew gum after surgery. Several recent studies showed a decrease in the duration of postoperative ileus in patients who chewed gum and there was some evidence that their hospital stay was shorter than non-gum chewers.

Walking after surgery, like gum chewing, is an easy way to help reduce the severity of symptoms and speed the return to normal.

Chewing gum or walking after surgery are ways to return the ileus to normal faster.

A Word From Verywell

It may not be normal for your to talk about flatulence in your day to day life, or you may be completely comfortable talking about toots and stinkers, either way, the day of your surgery is the day to get comfortable talking about your bodily functions. 

Be honest with the surgery staff about whether or not you've passed gas or had a bowel movement. The alternative to the candid approach may be postoperative ileus not being diagnosed in a timely fashion, which is not a good way to start your recovery.

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