Overview

Dumping syndrome is a condition that can develop after surgery to remove all or part of your stomach or after surgery to bypass your stomach to help you lose weight. Also called rapid gastric emptying, dumping syndrome occurs when food, especially sugar, moves from your stomach into your small bowel too quickly.

Most people with dumping syndrome develop signs and symptoms, such as abdominal cramps and diarrhea, 10 to 30 minutes after eating. Other people have symptoms one to three hours after eating, and still others have both early and late symptoms.

Generally, you can help prevent dumping syndrome by changing your diet after surgery. Changes might include eating smaller meals and limiting high-sugar foods. In more-serious cases of dumping syndrome, you may need medications or surgery.

Symptoms

Signs and symptoms of dumping syndrome generally occur right after eating, especially after a meal rich in table sugar (sucrose) or fruit sugar (fructose). Signs and symptoms might include:

  • Nausea
  • Vomiting
  • Abdominal cramps
  • Diarrhea
  • Flushing
  • Dizziness, lightheadedness
  • Rapid heart rate

Late dumping signs and symptoms, which occur one to three hours after eating, are due to your body releasing large amounts of insulin to absorb the large amount of sugars entering your small intestine after you eat a high-sugar meal. The result is low blood sugar.

Signs and symptoms of late dumping can include:

  • Sweating
  • Hunger
  • Fatigue
  • Dizziness, lightheadedness
  • Weakness
  • Rapid heart rate

Some people have both early and late signs and symptoms. Some people develop dumping syndrome years after surgery.

When to see a doctor

Contact your doctor if any of the following apply to you.

  • You develop signs and symptoms that might be due to dumping syndrome, even if you haven't had surgery.
  • Your symptoms are not controlled by dietary changes.
  • You are losing large amounts of weight due to dumping syndrome. Your doctor may refer you to a registered dietitian to help you create an eating plan.

Causes

In dumping syndrome, food and gastric juices from your stomach move to your small intestine in an uncontrolled, abnormally fast manner. This is most often related to changes in your stomach associated with surgery.

Dumping syndrome can occur after any stomach operation or removal of the esophagus (esophagectomy). Gastric bypass surgery for weight loss is the most common cause today.

Risk factors

Surgery that alters your stomach can increase your risk of dumping syndrome. These surgeries are most commonly performed to treat obesity, but are also  part of treatment for stomach cancer and other conditions. These surgeries include:

  • Gastrectomy, in which a portion or all of your stomach is removed.
  • Gastric bypass surgery (Roux-en-Y operation), which is performed to treat morbid obesity. It surgically creates a stomach pouch smaller than the stomach, meaning you're no longer able to eat as much as you once did. It connects the small intestine to this pouch in the form of a gastrojejunostomy.
  • Esophagectomy, where all or part of the tube between the mouth and the stomach is removed.
June 10, 2015
References
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  2. Adair JD, et al. Late complications of bariatric surgical operations. http://www.uptodate.com/home. Accessed Feb. 26, 2015.
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  4. Barbara Woodward Lips Patient Education Center. Dietary guidelines for managing dumping syndrome. Rochester, Minn.: Mayo Foundation for Medical Education and Research; 2013.
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