Feeding tubes are inserted through either the nose or the abdomen, depending on how long you’ll need the tube and what condition requires it. A tube through the nose (nasogastric tube) is a bedside procedure that takes about 10 to 15 minutes with no sedation. A tube placed directly into the stomach through the skin (gastrostomy tube) is a minor surgical procedure performed with sedation or local anesthesia. Here’s what each process actually involves.
Nasogastric Tubes: A Bedside Procedure
A nasogastric (NG) tube is a thin, flexible tube that goes through your nose, down your throat, and into your stomach. These are typically small-bore tubes, ranging from 5 to 12 French units in diameter (roughly 1.6 to 4 millimeters). They’re made from soft materials like silicone or polyurethane, which are more comfortable for longer use than older PVC tubes.
You sit upright with your neck slightly flexed forward, sometimes called the “sniffing position.” If you can’t sit up, you’ll lie on your left side. The nurse or doctor checks both nostrils to find the clearer one, then sprays a numbing agent into that nostril and the back of your throat at least five minutes before starting. A lidocaine gel may also be placed inside the nostril to reduce discomfort and help the tube slide through.
Before insertion, the clinician measures how far the tube needs to go. They hold the tube from the tip of your nose to your earlobe, then down to the bottom of your breastbone, and add about 15 centimeters (6 inches). Black marks on the tube serve as a guide during placement. The lubricated tip is then gently slid along the floor of the nasal cavity, angled back and downward to stay below the bony ridges inside your nose. When the tube reaches the back of your throat, you’ll be asked to take sips of water through a straw. Swallowing helps guide the tube into your esophagus rather than your windpipe. The tube is advanced during each swallow until it reaches the pre-measured depth.
The whole insertion is uncomfortable but not typically painful. You’ll feel pressure in your nose and a gagging sensation as the tube passes through your throat. That gagging usually subsides once the tube is past the back of your throat.
How Doctors Confirm the Tube Is in the Right Place
Getting the tube into the stomach and not the lungs is the single most important safety step. Right after insertion, the clinician asks you to speak. If you can’t talk, sound hoarse, gag violently, or have trouble breathing, the tube has likely entered the windpipe and is removed immediately.
A quick check involves pushing a small amount of air through the tube while listening with a stethoscope over your stomach. A rushing sound suggests the tube is in the right spot. But the gold standard for confirmation is a chest X-ray, which is strongly recommended before any feeding or medication is given through the tube. Testing the pH of fluid drawn back through the tube is another reliable first-line method: stomach acid has a distinctly low pH that confirms gastric placement.
Once confirmed, the tube is taped to your nose using a split piece of adhesive tape, with the two tails wrapped in opposite directions around the tube to keep it secure.
When Fluoroscopy Is Used Instead
Some patients have anatomy that makes blind bedside insertion risky or difficult. People with advanced head and neck cancers, burn injuries, recent esophageal surgery, or postoperative blockages may need their NG tube placed under fluoroscopy, a type of continuous X-ray that lets the doctor watch the tube’s path in real time. The setup is similar: numbing gel in the nostril, the tube inserted through the nose. But instead of relying on swallowing and feel, the clinician watches a live image on a screen as the tube travels through the throat, down the esophagus, and into the stomach. A guidewire inside the tube can add stiffness to help navigate tricky anatomy.
Gastrostomy Tubes: Placed Through the Abdomen
When feeding support is needed for more than a few weeks, doctors typically place a gastrostomy tube (G-tube) directly through the skin of the abdomen and into the stomach. The most common version is a PEG tube, short for percutaneous endoscopic gastrostomy. This is done in a procedure room or endoscopy suite, not in an operating room.
You’ll fast for at least eight hours beforehand. Most PEG placements use conscious sedation, meaning you’re given medication through an IV that makes you drowsy and relaxed but not fully asleep. In some cases, particularly for patients with neuromuscular conditions where sedation carries extra risk, the procedure can be done with local anesthesia alone. Lidocaine is injected into the skin and tissue at the puncture site, and studies have shown a 100% technical success rate with this approach, no sedation needed.
The Three Placement Techniques
There are three ways to place a PEG tube, though they all follow the same basic idea: a thin camera (endoscope) goes down your throat into your stomach, and a small incision is made through your abdominal wall to meet it.
- Pull technique (most common): The endoscope is passed into your stomach, and a needle is pushed through the abdominal wall into the stomach under direct camera view. A thread is passed through the needle, grabbed by a small loop tool inside the endoscope, and pulled back up through the mouth. The feeding tube is attached to this thread and pulled down through the mouth, into the stomach, and out through the abdominal wall. The doctor re-inserts the camera to confirm the tube sits properly against the stomach wall.
- Push technique: Similar to the pull method, but instead of pulling the tube from inside, a guidewire is brought out through the mouth and the tube is pushed over the wire, down through the mouth, and out through the abdomen.
- Direct technique (rare): The tube is pushed directly through the abdominal wall over a guidewire without passing through the mouth at all. A small balloon on the tube’s tip is inflated inside the stomach to hold it in place.
In all three methods, a small disc on the skin holds the tube in position, sitting about 3 to 4 centimeters from the abdominal wall. The entire procedure typically takes 20 to 30 minutes.
Complication Rates for Gastrostomy Tubes
Overall complication rates within 30 days of placement are relatively low. In a study comparing the two main approaches, push-type placements had a total complication rate of 6.7%, while pull-type placements came in at 9.2%. Most complications were minor: the tube accidentally coming out, mild infection around the site, or leakage at the skin opening.
Major complications are less common but more serious. They occurred in about 12.5% of all complications for push-type tubes and 35.3% for pull-type tubes. The most frequent major complication was aspiration, where stomach contents enter the lungs. Peritonitis (infection of the abdominal lining) and severe skin infection were rare but documented.
Recovery and Starting Feeds
For NG tubes, feeding can begin almost immediately once placement is confirmed by X-ray. There’s no recovery period since the procedure doesn’t involve any incision.
For PEG tubes, the traditional approach was to wait 24 hours before starting feeds. Updated guidelines from the European Society for Clinical Nutrition and Metabolism now recommend beginning tube feeding as early as four hours after placement. A study at Bern University Hospital found that patients who started feeds at four hours had significantly shorter hospital stays (an average of 15.4 days compared to 27.3 days for those who waited 24 hours), with no increase in complications. The soreness at the insertion site typically improves within a few days, though the site takes one to two weeks to heal around the tube.
You’ll start with small volumes of liquid nutrition and gradually increase to full feeding rates over the first day or two. The skin around a gastrostomy tube needs daily cleaning with soap and water once the site begins to heal, and the external disc should be checked regularly to make sure it hasn’t shifted.
NG Tube vs. Gastrostomy Tube
The choice between the two comes down to how long you’ll need nutritional support. NG tubes are meant for short-term use, generally up to four to six weeks. They’re quick to place, require no incision, and can be removed just as easily by gently pulling them out. The trade-off is ongoing discomfort in the nose and throat, and a visible tube taped to your face.
Gastrostomy tubes are designed for months to years of use. They’re hidden under clothing, more comfortable for daily life, and don’t interfere with swallowing or speaking. But they require a procedure, carry a small surgical risk, and leave a site that needs ongoing care. For people with conditions like stroke, head and neck cancer, or progressive neurological disease where swallowing problems won’t resolve quickly, a gastrostomy tube is the more practical long-term option.