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Dumping syndrome: the signs, the causes, the tests, and how to eat
For anyone who gets diarrhea, cramps, a racing heart, sweating or shakiness after meals, especially after weight-loss surgery or surgery on the stomach or esophagus, and for the people who care for them. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK, part of the NIH) says dumping syndrome is a group of symptoms caused by rapid gastric emptying, when food moves too quickly from the stomach into the small intestine, and that many people have mild symptoms that improve over time with simple changes in how and what they eat. This page passes on, by name, what NIDDK says: early and late dumping and their signs; the surgeries and conditions behind it; your history, your symptoms and the tests; eating changes first, then kinds of medicine, and sometimes surgery; and how and what to eat. It builds the words to say to a doctor, and prints a card to keep.
Right now
- Someone fainted and is not waking up right away, is confused or very hard to wake, has a seizure, or has chest pain or trouble breathing? Call 911 (ours).
- Shaky, sweaty, weak or light-headed 1 to 3 hours after a meal? NIDDK says late dumping is caused by low blood sugar. If your care team gave you a plan for low blood sugar, follow it; sit or lie down, and do not drive until it passes (ours).
- Skipping meals because of symptoms, or losing weight you did not plan to lose? NIDDK says avoiding eating can lead to weight loss and malnutrition. Tell your care team soon (ours).
- It is all too much, or you are thinking of ending your life? Call or text 988, any hour (ours).
More help
- The belly, on this site: Gastroparesis · Short bowel syndrome · Vomiting and diarrhea · Gas and bloating · An upset stomach: find the right page.
- Conditions NIDDK names: Diabetes · Peptic ulcers · Pancreatitis · Heartburn and acid reflux · Barrett’s esophagus.
- Day to day: Symptom diary · Blood sugar log · Weight log · My medicines list · Get ready for your appointment.
- Care and costs: When you need a doctor and can’t pay · When you can’t afford your medicine · When you need food.
- In a crisis: Help right now (988, 911). All our free tools.
An upset stomach, and not sure this is the right page? The pages on this site for throwing up, diarrhea, heartburn and constipation, on one list.
This page and its wording were written with AI (Claude) for Scarlet Beast (our AI policy). No doctor or nurse has reviewed it. The facts were read on October 17, 2026 on NIDDK’s Dumping Syndrome pages (NIH): the overview, Definition & Facts, Symptoms & Causes, Diagnosis, Treatment and Eating, Diet, & Nutrition, and their Spanish versions; all were last reviewed in January 2019 and say the same things. NIDDK names two medicines; we describe them by kind and how they are given, without names. Ours: 911 if someone faints and does not wake up right away, is confused or very hard to wake, has a seizure, or has chest pain or trouble breathing; following the plan your care team gave you for low blood sugar; sitting or lying down, and not driving, while light-headed; telling your care team about skipped meals or weight loss; asking about a registered dietitian; not stopping a prescribed medicine on your own; the card; 988 when it is too much; health centers and food help when money is tight; and the order of the steps. What we left out: medicine names, brands, doses, research studies, and clinical pages for providers. This page saves nothing and loads no trackers.