Gastric Sleeve Surgery: What Happens on the Day

On the day of gastric sleeve surgery you are admitted in the morning, seen by your surgeon and anaesthetist, then taken to theatre for a keyhole operation under general anaesthetic that takes about 1 to 2 hours, after which most people stay in hospital 1 to 2 nights. Knowing the order of the day in advance takes a lot of the fear out of it.

I remember sitting on the edge of the hospital bed in a paper gown, more nervous about the unknown than the surgery itself. So here is exactly how the day unfolds, step by step.

Admission and getting ready

You are usually admitted on the morning of surgery, though some people come in the night before. A nurse checks you in, takes your blood pressure, pulse, and temperature, confirms you have followed any pre-surgery diet and fasting instructions, and gives you a gown and compression stockings to help prevent blood clots. You will be asked to fast (typically no food for several hours and no drinks for around 2 hours, exactly as your team directs). Most of the morning is waiting and paperwork rather than anything dramatic, and the practical steps you took to prepare pay off here.

Seeing your surgeon and anaesthetist

Before theatre, your surgeon and anaesthetist both see you. The surgeon confirms the plan, answers last questions, and marks any details on your consent form. The anaesthetist goes through your medical history, allergies, and previous anaesthetics, then explains how you will be put to sleep. A sleeve gastrectomy is done under general anaesthetic, meaning you are fully unconscious throughout. This is also when you can raise anything that is worrying you; they would far rather you asked.

The operation itself

The sleeve is done laparoscopically (keyhole), through a few small cuts in the abdomen rather than one large incision. The surgeon removes roughly 70 to 80% of the stomach and staples the rest into a narrow, banana-shaped tube. The operation typically takes about 1 to 2 hours, though you are in theatre a little longer for the anaesthetic and positioning. Because it is keyhole rather than open surgery, blood loss is usually lower and recovery quicker. You are asleep for all of it and aware of none of it.

Waking up in recovery

You wake in a recovery area, monitored closely by nursing staff, often with an oxygen mask, a drip in your arm, and gentle pain relief already running. Grogginess, a dry mouth, and a sore, bloated tummy are normal; the carbon dioxide gas used to inflate the abdomen during keyhole surgery can also cause shoulder-tip pain that settles over a day or two. Pain is managed actively, so tell the nurses if it is not controlled. Once you are stable and awake enough, you are moved back to the ward.

The hospital stay

Most people stay in hospital 1 to 2 nights. You are usually encouraged up and walking the same day, because gentle movement lowers the risk of blood clots (VTE), one of the named risks of any major surgery. You start on small sips of clear fluid once your team is happy it is safe, and build up slowly from there. Before discharge, your team checks that your pain is controlled, you are drinking, and you are steady on your feet, and they go through your medication, follow-up, and the early diet stages.

What comes next

Going home is the start of recovery, not the end of it. The first couple of weeks are mostly rest, short walks, and sipping fluids, with most people back to desk work in about 2 to 4 weeks and avoiding heavy lifting for 4 to 6 weeks. What recovery is really like week by week, and the staged diet from liquids to solids, each have their own guide.

For me, the day felt long in the waiting and then surprisingly quick once it started: I was walking, slowly, the same evening, and home inside two days.

This is general information, not medical advice. The exact plan for your day, your anaesthetic, and your stay should come from your GP and bariatric team, who can assess you individually.