NG tube not draining and the client is nauseated: what to check first

Why nausea with no drainage is a warning

A decompression tube is there to keep the stomach empty, for example in bowel obstruction, ileus or after major surgery. When drainage stops and nausea starts, the likely problem is that the tube is not removing contents. The stomach can distend, and vomiting around the tube raises the risk of aspiration.

An antiemetic may ease the feeling, but it does not empty the stomach. That is why exam questions rank finding the mechanical problem above treating the symptom. Raise the head of the bed while you check, to reduce reflux, and keep an emesis bowl and suction within reach.

Check placement first, then the suction system

Look at the external length mark against the documented value, check that the tape is secure, and look in the mouth for a coiled tube. Coughing, retching and vomiting are times when position is reassessed. If the tube appears displaced, report it so placement can be confirmed by an approved method rather than guessed.

Next follow the system from the client to the wall. Confirm the suction is switched on at the ordered setting, which differs by tube type, and that connections are tight and the tubing is not kinked or clamped. For a double-lumen sump tube, keep the vent open and above the stomach level. Facility procedures list checking suction before irrigating.

Restore patency only as ordered

If placement and suction are correct, the tube may be blocked with thick contents. Irrigation with the ordered solution and volume is a common next step, and some procedures also allow repositioning the client on the side. If drainage still does not return, notify the prescriber rather than repeating irrigations.

After gastric or oesophageal surgery, the tube often sits near a fresh anastomosis and is placed by the surgeon. Trial evidence after oesophagectomy links decompression with fewer anastomotic leaks, and tubes are often dislodged. Do not advance, pull back or irrigate such a tube unless the surgeon has ordered it; report the problem.

What can wait, what can be delegated and the distractors

Mouth care, nostril skin care and documenting output matter but can follow the safety checks. Assistive staff can provide mouth care, measure and empty drainage, and report vomiting. Checking placement, irrigating and deciding about antiemetics belong to the registered nurse under the order.

Distractors include giving the antiemetic first, increasing suction to high continuous pressure to force drainage, or pushing the tube in further. The first hides the problem, the second can injure the stomach lining, and the third may be dangerous after surgery or misplace the tube. Each skips the systematic check.

Practise with a hypothetical client

Imagine a hypothetical client with small bowel obstruction whose nasogastric tube has drained nothing for two hours and who now feels nauseated. Options are to give the prescribed antiemetic, check the tube's external mark and suction setting, increase suction to high continuous, or insert a new tube.

Checking the mark and suction setting is the strongest first action because it finds the most likely, quickly fixable cause. The antiemetic treats the symptom, high suction risks mucosal injury, and a new tube is premature. If this client had recent gastric surgery, the nurse would report rather than irrigate without orders. This original example is for study only.

Sources and further reading

Memorial Medical Center: Nasogastric tube insertion, care and removal (procedure). Checking suction equipment when there is no drainage, then irrigating or repositioning, and notifying the physician if drainage does not return.

Lancet Regional Health Europe via PMC: Nasogastric tube after oesophagectomy and risk of anastomotic leak (2025). Purpose of decompression after oesophagectomy, fewer leaks with a tube, and frequent accidental dislodgement.

NHS Borders: Enteral feeding for adults clinical guideline. Reassessing nasogastric tube position after vomiting, retching or coughing, and signs of displacement.