What Is Gastroparesis?
Gastroparesis literally means "stomach paralysis." It is a condition characterised by delayed gastric emptying in the absence of a mechanical obstruction. In a healthy stomach, coordinated contractions of the antral muscles grind food into small particles and propel them through the pyloric sphincter into the duodenum. In gastroparesis, these contractions are weak, uncoordinated, or absent, causing food to remain in the stomach for hours longer than normal.
The condition affects approximately 4% of the population, with women affected at a 4:1 ratio compared to men. It is frequently underdiagnosed because its symptoms overlap with functional dyspepsia, GERD, and other upper GI conditions.
Causes of Gastroparesis
Diabetic Gastroparesis
Diabetes is the most common identifiable cause, accounting for approximately one-third of gastroparesis cases. Chronic hyperglycaemia damages the vagus nerve (diabetic autonomic neuropathy), impairs the interstitial cells of Cajal (the pacemaker cells of the stomach), and alters gastric smooth muscle function. Both type 1 and type 2 diabetes can cause gastroparesis, though it is more common and typically more severe in type 1 diabetes.
Post-Surgical Gastroparesis
Surgical procedures that damage or transect the vagus nerve can cause gastroparesis. Fundoplication (for GERD), bariatric surgery, and other upper abdominal operations carry this risk. Post-surgical gastroparesis may improve over months as collateral nerve pathways develop, or it may be permanent.
Idiopathic Gastroparesis
In approximately 35-40% of cases, no identifiable cause is found. However, many idiopathic cases are suspected to be post-viral or post-infectious: a viral illness (often a respiratory or gastrointestinal infection) damages the vagus nerve or the interstitial cells of Cajal, leading to delayed gastric emptying that may or may not resolve over time. The Covid-19 pandemic has been associated with a notable increase in new gastroparesis diagnoses.
Other Causes
- Medications — opioids, GLP-1 receptor agonists, anticholinergics, and calcium channel blockers can all slow gastric emptying
- Connective tissue disorders — scleroderma, Ehlers-Danlos syndrome, and other connective tissue conditions
- Neurological conditions — Parkinson's disease, multiple sclerosis
- Hypothyroidism — thyroid hormone deficiency slows gastric motility
Symptoms
The hallmark symptoms of gastroparesis include:
- Nausea — the most common and often most distressing symptom, frequently present throughout the day
- Early satiety — feeling uncomfortably full after eating only a small amount of food
- Vomiting — often of partially digested food eaten hours earlier; in severe cases, vomiting of food consumed the previous day
- Bloating and upper abdominal distension — food sitting in the stomach causes visible swelling
- Epigastric pain — upper abdominal pain that may be constant or worsen after eating
- GERD symptoms — a full, slowly emptying stomach increases the risk of acid reflux
- Weight loss and malnutrition — in severe cases, patients cannot maintain adequate nutritional intake
Diagnostic Testing
Gastric Emptying Scintigraphy (GES)
This is the gold standard diagnostic test. You eat a standardised meal (typically scrambled eggs with a radioactive tracer) and a gamma camera tracks how quickly the meal empties from your stomach over 4 hours. Retention of more than 10% of the meal at 4 hours confirms delayed gastric emptying.
Smart Pill (Wireless Motility Capsule)
A swallowed capsule measures pressure, pH, and temperature as it travels through the entire GI tract. It provides transit time data for the stomach, small intestine, and colon. This test is useful for assessing global GI motility rather than gastric emptying in isolation.
Gastric Emptying Breath Test
A non-radioactive alternative using a C-13 labelled meal and breath sample collection. It is gaining acceptance as a radiation-free option, particularly for repeated testing.
Management Strategies
Dietary Modifications
Dietary changes are the first line of gastroparesis management and can produce significant symptom improvement:
- Eat 4-6 small meals per day rather than 2-3 large meals
- Reduce dietary fat (fat slows gastric emptying; limit to less than 40g per day during flares)
- Reduce dietary fibre during symptomatic periods (fibre forms bezoars in severely delayed stomachs)
- Favour soft, well-cooked, or pureed foods that require less mechanical processing
- Drink fluids between meals rather than with meals to avoid gastric distension
- Remain upright or walk gently for 1-2 hours after eating
Prokinetic Medications
- Metoclopramide — the only FDA-approved medication for gastroparesis; improves gastric emptying but carries a risk of tardive dyskinesia with long-term use
- Domperidone — a peripheral dopamine antagonist with fewer CNS side effects than metoclopramide; not FDA-approved in the US but available through compassionate use programmes
- Erythromycin — at low doses, acts as a motilin receptor agonist; most effective for acute symptom management but tachyphylaxis limits long-term use
- Prucalopride — a 5-HT4 agonist primarily used for chronic constipation but with evidence for improving gastric emptying
Natural Prokinetics
- Ginger — clinical evidence shows 1.2g of ginger accelerates gastric emptying significantly
- Iberogast — multiple clinical trials support its use for functional dyspepsia and gastroparesis symptoms
- Acupuncture — stimulation of the PC6 (Neiguan) and ST36 (Zusanli) acupoints has shown efficacy for gastroparesis-related nausea in controlled trials
GutIQ's assessment evaluates upper GI symptom patterns that may suggest gastroparesis or other motility disorders, helping you determine when specialised testing and management strategies are appropriate.