Gastroparesis Complications

Gastroparesis complications arise when the stomach empties too slowly for too long. The most common are dehydration, malnutrition with unintended weight loss, hardened clumps of food called bezoars, and blood sugar that is hard to control. Most of these problems are manageable, and many are preventable, when they are caught early.

What are the complications of gastroparesis?

Gastroparesis is usually a long-term condition rather than a sudden emergency, but the slow stomach emptying behind it can cause several problems over time. The National Institute of Diabetes and Digestive and Kidney Diseases lists the main complications as dehydration, malnutrition, blood glucose that is harder to control, bezoars, unintended weight loss, and a lower quality of life. The risk is greatest when symptoms such as vomiting are frequent or poorly managed. Our page on gastroparesis symptoms describes the day-to-day signs to watch for; this page explains the longer-term risks and how doctors prevent and treat them.

How does gastroparesis cause dehydration and malnutrition?

Two of the most common complications come from the same root problem: food and fluids do not move through the stomach normally. Repeated vomiting and the inability to keep liquids down can lead to dehydration and a loss of important electrolytes such as sodium and potassium. Over a longer period, poor appetite, early fullness, and reduced absorption of nutrients can lead to malnutrition, a low calorie intake, and weight loss that was not intended.

Severe dehydration or malnutrition sometimes requires hospital care with intravenous fluids or nutrition support, as our page on gastroparesis treatment explains. Eating small, frequent, nutrient-dense meals and staying well hydrated are the first steps in preventing both. These risks rise sharply during a gastroparesis flare-up, when symptoms spike and keeping fluids down becomes hard.

What is a bezoar, and why is it dangerous?

A bezoar is a hard mass that forms when undigested food collects and compacts inside the stomach. Because gastroparesis leaves food sitting in the stomach far longer than normal, that food can clump together over time. A bezoar can worsen nausea and vomiting, and if it grows large enough it can block the outlet at the bottom of the stomach, a problem called gastric outlet obstruction that stops other food from passing through. High-fiber and fibrous foods are the most likely to form bezoars, which is one reason the gastroparesis diet limits them. Our list of gastroparesis foods to eat and avoid shows which foods raise the risk.

How do gastroparesis complications affect blood sugar?

When the stomach empties at an unpredictable pace, the timing of glucose entering the bloodstream becomes unpredictable too. This makes blood sugar harder to control and can worsen diabetes, swinging between high and low levels that are difficult to anticipate. The connection runs both ways, because high blood sugar also slows stomach emptying further. For people with diabetes, this is one of the most important complications to manage, and it is covered in depth on our page about diabetic gastroparesis. Anyone whose blood sugar becomes very high or very low should contact their healthcare provider promptly.

Can gastroparesis cause acid reflux problems?

Yes. When food and stomach acid back up into the esophagus, the result is chronic acid reflux. Cleveland Clinic notes that this ongoing reflux can cause heartburn and inflammation of the esophagus, known as esophagitis. Persistent heartburn is worth mentioning to your doctor, both for comfort and because long-standing reflux needs its own management. Eating smaller meals, staying upright for an hour or two after eating, and avoiding meals close to bedtime can reduce reflux.

How are gastroparesis complications managed?

Most complications are managed by treating the gastroparesis itself and watching closely for early warning signs. A low-fat, low-fiber diet of small, frequent meals eases the load on the stomach and lowers the risk of bezoars and weight loss, as our gastroparesis diet page describes. Medications can help when diet alone is not enough, including drugs that speed stomach emptying and others that control nausea and vomiting, which are covered on our page about gastroparesis medications.

For people with diabetes, keeping blood glucose in the target range protects against the blood-sugar swings above. Severe cases, with ongoing vomiting, dehydration, or malnutrition, may need hospital care with fluids and nutrition support. When symptoms are severe enough to make working difficult, our page on gastroparesis and disability benefits explains how Social Security evaluates a claim. Staying in regular contact with your care team is the best way to catch a complication before it becomes serious.

Sources

Reviewed by Owen Hastings. NIDDK (National Institute of Diabetes and Digestive and Kidney Diseases), Definition and Facts for Gastroparesis and Symptoms and Causes of Gastroparesis (niddk.nih.gov), last reviewed January 2018, for dehydration, malnutrition, low calorie intake, hard-to-control blood glucose, bezoars, unintended weight loss, and lower quality of life. Cleveland Clinic, Gastroparesis (my.clevelandclinic.org), for bezoars and gastric outlet obstruction, dehydration with electrolyte loss, esophagitis from chronic acid reflux, and hospital care in severe cases. This page is general health information, not medical advice. Talk to your doctor about your own care. Last reviewed June 2026.