An NJ tube (nasojejunal tube) is a thin, flexible feeding tube that goes in through the nose, passes down the throat and through the stomach, and ends in the jejunum, which is the middle section of the small intestine. It delivers liquid nutrition and sometimes medications directly past the stomach, which is necessary when the stomach can’t safely process food on its own. NJ tubes are temporary, typically approved for up to 30 days before they need to be replaced or swapped for a longer-term option.
Why an NJ Tube Instead of a Standard Feeding Tube
The more common nasal feeding tube is the NG (nasogastric) tube, which ends in the stomach. An NJ tube goes further, bypassing the stomach entirely. This distinction matters for people whose stomachs aren’t functioning properly or whose condition worsens when food enters the stomach.
In severe acute pancreatitis, for instance, nutrients entering the stomach can stimulate the pancreas to produce digestive enzymes, aggravating the inflammation. Delivering nutrition directly to the jejunum avoids triggering those secretions and lets the pancreas rest. The same bypass logic applies to gastroparesis, where the stomach’s muscles don’t contract normally and food sits too long, and to gastric outlet obstruction, where a tumor, ulcer, or other blockage prevents food from leaving the stomach. Severe reflux that puts someone at high risk of inhaling stomach contents into the lungs is another common reason.
How the Tube Is Placed
Placement methods vary depending on the facility and the patient’s condition. The simplest approach is blind bedside placement, where a clinician guides the tube through the nose and lets the body’s natural digestive contractions carry it into the jejunum. However, blind placement has failure rates of 40% to 50%, meaning the tube often doesn’t reach the right spot without help.
For more reliable positioning, clinicians use fluoroscopy (real-time X-ray) or endoscopy (a small camera threaded into the digestive tract) to watch the tube as it moves and steer it into place. Fluoroscopy is particularly useful for patients who are critically ill or have unusual anatomy that makes blind placement risky. Once the tube is in position, an X-ray confirms the tip is sitting in the jejunum before any feeding begins. This imaging confirmation is the gold standard for verifying correct placement.
What Daily Life With an NJ Tube Looks Like
Liquid formula runs through the tube using a feeding pump, which controls the rate and volume. Most people receive continuous or scheduled feedings rather than large bolus meals, since the jejunum absorbs nutrients differently than the stomach. You won’t feel “full” the way you would after eating normally, which can be an adjustment.
The most important maintenance task is flushing. The tube should be flushed with 30 to 60 milliliters of warm water every 4 to 6 hours during feeding, any time the pump is turned off, and after giving medications. This prevents clogging, which is one of the most common problems. The tube is narrow, and formula or crushed medication can build up inside it quickly if flushing is skipped.
Giving Medications Through an NJ Tube
Some medications can be given through an NJ tube, but the rules are stricter than with a stomach-level tube. Any medication must be in liquid form or crushed into a fine powder and mixed with water before going through. Extended-release and enteric-coated medications generally cannot be crushed, because their coatings are designed to control where and how fast the drug is absorbed. Crushing them defeats that design and can cause side effects or make the drug ineffective.
There’s an additional wrinkle with NJ tubes specifically: medications that need stomach acid to activate (called prodrugs) won’t work properly when delivered straight to the jejunum. Warfarin, a common blood thinner, clings to the inside of feeding tubes and shouldn’t be given this way. Iron supplements in tablet form are also unsuitable. Your pharmacist or care team will review every medication to determine which ones are safe for tube delivery and which need an alternative form or route.
Common Problems and Complications
Minor issues are frequent. The tube can cause discomfort in the nose and throat, a persistent foreign-body sensation, and occasional nosebleeds. Tube blockage from dried formula is probably the most day-to-day frustration, and it’s largely preventable with consistent flushing. Kinking, where the tube bends sharply and stops flow, and dislodgment, where the tube migrates out of position, are also common. Because the tube travels a long path through the digestive tract, normal intestinal contractions can gradually push it backward into the stomach. When that happens, placement needs to be re-verified and the tube repositioned.
Serious complications are less common but possible. The tube rubs against the intestinal lining as the gut contracts, which over time can cause ulceration. In rare cases, this friction leads to bleeding or perforation (a hole in the intestinal wall). These are the main reasons NJ tubes are considered temporary. After 30 days, the polyurethane material also begins to degrade, so the tube must be replaced or the care team will discuss transitioning to a more permanent surgical option like a jejunostomy tube if long-term feeding is needed.
How Effective NJ Tubes Are at Preventing Aspiration
One of the primary reasons for choosing an NJ tube over stomach-level feeding is to reduce the risk of aspiration, where liquid or food enters the lungs. NJ tubes do lower this risk compared to eating by mouth. In one study of patients prone to aspiration pneumonia, re-aspiration rates over six months were 78% with NJ feeding compared to 91% with oral feeding. However, NJ tubes don’t eliminate the risk entirely. Surgically placed gastrostomy tubes (PEG tubes) performed even better in the same study, with a 58% re-aspiration rate, along with higher patient satisfaction.
This is partly why NJ tubes are typically a bridge, not a destination. They work well for short-term nutritional support while a patient recovers from acute illness or while the medical team determines whether a longer-term surgical tube is warranted.
When an NJ Tube Transitions to Something Else
If someone needs tube feeding beyond the 30-day window, the typical next step is a surgically or endoscopically placed tube that goes directly through the abdominal wall into the stomach (gastrostomy) or jejunum (jejunostomy). These are more durable, more comfortable for long-term use, and don’t involve having a tube taped to your face. The decision depends on whether the underlying condition is resolving or chronic, and whether the stomach can eventually be used again for feeding.