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Health condition · Clinically reviewed

Gastroparesis, diet, prokinetics and specialist motility care.

When the stomach empties too slowly, small changes in diet and glycaemia matter first. For refractory disease, UK specialist commissioned motility services offer G-POEM, gastric stimulation and MDT care.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against AGA, ACG and BSG motility standards you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice including gastric emptying scintigraphy, prokinetics, G-POEM and gastric electrical stimulation.

Key facts

Gastroparesis at a glance.

The essentials, in plain English - what it is, what causes it, and how UK specialist services treat it today.

  • What it is

    Delayed gastric emptying in the absence of mechanical obstruction. A chronic and often disabling motility disorder.

  • Main causes

    Diabetes (most common), post-surgical (vagal injury after fundoplication or bariatric surgery), idiopathic (around 30 per cent) and medications.

  • Presentation

    Early satiety, postprandial fullness, nausea, vomiting of undigested food hours after eating, bloating, weight loss.

  • Gold-standard test

    Solid-meal gastric emptying scintigraphy over four hours, after obstruction is excluded on OGD or imaging.

  • Foundation therapy

    Specialist gastro dietitian-led small, frequent, low-fat, low-fibre meals with liquids favoured over solids.

  • Advanced options

    Prokinetics, pyloric botulinum toxin, G-POEM, gastric electrical stimulation and jejunal feeding for refractory disease.

Why this guide matters

A stepped plan, not a lifetime of symptoms.

Gastroparesis is chronic and often disabling, but a structured ladder from diet through prokinetics to specialist commissioned procedures makes a real difference.

  • Exclude obstruction first

    OGD and cross-sectional imaging come before scintigraphy - you cannot diagnose gastroparesis while a mechanical outlet problem is possible.

  • Diet is the foundation

    Specialist gastro dietitian input on small, low-fat, low-fibre meals often does more than any single drug.

  • Refractory disease has options

    Pyloric botulinum toxin, G-POEM and gastric electrical stimulation change outcomes in patients who have failed standard care.

How the diagnosis is made

From vague nausea to a clear motility diagnosis.

The steps a UK gastroenterologist will normally follow, in order - so you know what to expect and why.

  1. 01

    Assessing

    History and symptom pattern

    Early satiety, nausea, vomiting of undigested food hours after eating, bloating and weight loss point to a motility problem, not reflux alone.

  2. 02

    Assessing

    Medication and surgical review

    Opioids, GLP-1 agonists (semaglutide, tirzepatide), anticholinergics, calcium channel blockers, tricyclics and prior vagotomy or fundoplication all delay emptying.

  3. 03

    Assessing

    Bloods and endocrine screen

    FBC, U and Es, HbA1c, thyroid function, coeliac serology, inflammatory markers and autoimmune antibodies as clinically indicated.

  4. 04

    Confirming

    Rule out obstruction

    Upper GI endoscopy (OGD) and cross-sectional imaging first, to exclude mechanical outlet obstruction before labelling anyone with gastroparesis.

  5. 05

    Confirming

    Gastric emptying scintigraphy

    The gold-standard test: a standardised low-fat solid meal tracked over four hours by a specialist commissioned nuclear medicine service.

  6. 06

    Preparing

    Second-line motility tests

    13C octanoate breath test, wireless motility capsule or high-resolution manometry in a specialist commissioned motility centre when scintigraphy is equivocal.

  7. 07

    Preparing

    Specialist motility MDT

    Gastroenterology, endocrinology, upper GI surgery, dietitian and psychology at a specialist commissioned motility service for refractory disease.

Typical timeline: weeks from GP referral to a scintigraphy-confirmed diagnosis and a written plan.

Symptoms

What gastroparesis actually feels like.

A cluster of postprandial symptoms with weight loss and, in diabetes, glycaemic instability. And the features that mean it is time to escalate.

  • Early satiety and fullness

    Feeling uncomfortably full within a few mouthfuls, with prolonged postprandial fullness for hours afterwards.

  • Nausea

    Persistent daily nausea, often worse after meals and a major driver of quality-of-life impact.

  • Vomiting of undigested food

    Retained solid food brought back hours after eating, a classic feature of delayed emptying.

  • Bloating and upper abdominal pain

    Distension and a heavy epigastric discomfort, sometimes with visible fullness after meals.

  • Weight loss and malnutrition

    Chronic reduced intake leads to weight loss, sarcopenia and micronutrient deficiency.

  • Erratic glycaemic control

    In diabetes, unpredictable emptying causes swings between hypoglycaemia and postprandial hyperglycaemia.

  • Dehydration

    Repeated vomiting and reduced fluid intake lead to dehydration and electrolyte disturbance, especially hypokalaemia.

  • Red flag - bezoar or haematemesis

    Retained food can form a gastric bezoar, and forceful vomiting can cause a Mallory-Weiss tear needing urgent review.

Treatment

How gastroparesis is treated in the UK.

Diet and glycaemic control first; prokinetic and antiemetic drugs next; and specialist commissioned procedures (pyloric botulinum toxin, G-POEM, Enterra) for refractory disease.

  • Specialist dietitian plan

    Small, frequent, low-fat, low-fibre meals with soft foods and liquid nutrition, avoiding alcohol, fizzy drinks and smoking. The single most useful intervention.

  • Optimise glycaemic control

    In diabetes, tighter glucose control and structured education reduce symptoms and slow further autonomic damage.

  • Medication review

    Stop or swap opioids, GLP-1 agonists, anticholinergics, calcium channel blockers and other drugs that delay emptying, where clinically safe.

  • Metoclopramide

    First-line prokinetic. MHRA restricts to short courses (up to 5 days) because of tardive dyskinesia and QT prolongation.

  • Domperidone

    Second-line prokinetic. MHRA advises the lowest effective dose for the shortest time because of cardiac risk; ECG review is often prudent.

  • Erythromycin or azithromycin

    Motilin receptor agonists used off-label as prokinetics. Tachyphylaxis limits long-term efficacy.

  • Antiemetics and neuromodulators

    Ondansetron and prochlorperazine for nausea; mirtazapine helps nausea and appetite; low-dose amitriptyline can ease pain-predominant symptoms.

  • Pyloric botulinum toxin

    Endoscopic botulinum toxin injection into the pylorus at a specialist gastroenterology service - selective evidence, useful as a bridging trial before G-POEM.

  • G-POEM

    Gastric peroral endoscopic myotomy: an endoscopic pyloromyotomy at a specialist commissioned centre with good evidence for refractory disease.

  • Gastric electrical stimulation

    Enterra device implanted at a specialist commissioned centre. Best evidence in refractory diabetic gastroparesis for symptom control.

  • Surgical options

    Pyloroplasty, partial gastrectomy or subtotal gastrectomy are reserved for highly selected refractory patients under specialist upper GI surgery.

  • Enteral or parenteral feeding

    Nasojejunal tube, surgical jejunostomy or PEG-J feeding for severe malnutrition, coordinated by a specialist commissioned nutrition team.

What this guide is based on

The sources behind every claim on this page.

International society guidance and UK regulatory advice, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, gastroenterologist or specialist motility team knows your case and can tell you which parts apply to you. If in doubt, get seen.

  • American Gastroenterological Association (AGA). Gastroparesis clinical practice update.

  • American College of Gastroenterology (ACG). Clinical guideline: gastroparesis (2022).

  • British Society of Gastroenterology (BSG). Guidance on adult neurogastroenterology and motility disorders.

  • MHRA. Drug safety updates on metoclopramide and domperidone.

  • NICE. Diabetes in adults: management guidance relevant to diabetic autonomic neuropathy.

Red flags

When gastroparesis needs urgent attention.

Stable disease is managed in the community. These are the situations where hospital review or specialist commissioned motility care is needed.

  • Severe dehydration and electrolyte loss

    Persistent vomiting with hypokalaemia, acute kidney injury or postural collapse needs urgent hospital review.

  • Uncontrolled diabetic ketoacidosis

    Unpredictable emptying can trigger DKA in type 1 diabetes. Ketones with vomiting is a same-day emergency.

  • Haematemesis or Mallory-Weiss tear

    Forceful vomiting causing fresh blood or coffee-ground vomitus needs urgent upper GI endoscopy.

  • Gastric bezoar

    A mass of retained food or hair causing obstruction, early satiety and pain - may need endoscopic disruption.

  • Rapid unintentional weight loss

    More than 5 per cent body weight lost in three months warrants urgent nutrition review and imaging to exclude malignancy.

  • New paraneoplastic presentation

    Sudden severe gastroparesis without diabetes or surgery should prompt a search for underlying cancer, particularly small cell lung.

  • Post-surgical gastroparesis after Nissen

    New severe symptoms after fundoplication (see /treatments/laparoscopic-nissen-fundoplication/) suggest vagal injury and need surgical review.

  • GLP-1 agonist related delay

    Semaglutide or tirzepatide can dramatically delay emptying; anaesthetic teams should know before any procedure with sedation.

  • Refractory nausea with weight loss

    Failure to respond to standard first-line therapy is a threshold for referral to a specialist commissioned motility service.

Living with it

A chronic condition, with real levers.

Four things that make the biggest difference day to day - meal shape, hydration, glycaemic vigilance and connection to specialist services and peer support.

A quiet reminder

Small, steady meals beat any heroic week.

Predictable, low-fat, small volumes across the day almost always outperform any single medication change.

  1. 01 Meals

    Small, frequent, soft

    Six small meals a day, low fat and low fibre, with soft or blended textures on bad days. Liquids often sit better than solids.

  2. 02 Hydration

    Sip through the day

    Small volumes of oral rehydration solution across the day protect against the electrolyte swings that make symptoms worse.

  3. 03 Glycaemia

    Watch the numbers if diabetic

    Continuous glucose monitoring and closer insulin timing help match the erratic emptying that gastroparesis causes.

  4. 04 Support

    You are not alone

    Gastroparesis UK and specialist commissioned motility services offer peer support, dietitian input and psychological care alongside medical therapy.

Frequently asked

Everything we get asked about gastroparesis.

Quick answers on diet, prokinetics, gastric emptying tests, G-POEM and gastric electrical stimulation.

  • What is gastroparesis?

    A chronic motility disorder in which the stomach empties too slowly in the absence of a mechanical blockage. It causes nausea, vomiting of undigested food, early satiety, bloating, weight loss and, in diabetes, erratic glucose control. It sits on a spectrum with functional dyspepsia and often needs specialist assessment.

  • What causes gastroparesis?

    The commonest cause is long-standing diabetes with autonomic neuropathy. Other causes include vagal injury after fundoplication or bariatric surgery, idiopathic disease (around 30 per cent), medications such as opioids and GLP-1 agonists, neurological conditions including Parkinson’s disease and MS, and connective tissue disorders such as systemic sclerosis or Ehlers-Danlos syndrome.

  • How is it diagnosed?

    By first ruling out mechanical obstruction with upper GI endoscopy and imaging, then confirming delayed emptying on a solid-meal gastric emptying scintigraphy over four hours at a specialist commissioned nuclear medicine service. Breath testing and wireless motility capsules are used when scintigraphy is not conclusive.

  • What is the mainstay of treatment?

    Dietary optimisation with a specialist gastroenterology dietitian is the foundation: small, frequent, low-fat, low-fibre meals, soft textures, adequate hydration and avoidance of alcohol, fizzy drinks and smoking. In diabetes, tightening glycaemic control also improves symptoms.

  • Are the prokinetic drugs safe?

    They are useful but have real limits. Metoclopramide is MHRA-restricted to short courses of up to five days because of tardive dyskinesia and QT prolongation. Domperidone requires the lowest effective dose for the shortest time due to cardiac risk. Erythromycin loses effect with prolonged use (tachyphylaxis).

  • What if diet and drugs are not enough?

    Refractory disease is managed at a specialist commissioned motility service. Options include endoscopic pyloric botulinum toxin (see /treatments/botox-pyloric-gastroparesis/), G-POEM (see /treatments/g-poem-gastric-peroral-endoscopic-myotomy/), gastric electrical stimulation with an Enterra device (see /treatments/gastric-electrical-stimulation-enterra/), surgical pyloroplasty or gastrectomy, and jejunal or PEG-J feeding for malnutrition.

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