Dumping syndrome after gastric bypass surgery is when food gets “dumped” directly from your stomach pouch into your small intestine without being digested. There are two types of dumping syndrome: early and late. Early dumping happens 10 to 30 minutes after a meal. Late dumping happens 1 to 3 hours after eating. Each has slightly different symptoms.

Early dumping syndrome can occur because of the dense mass of food that gets dumped into your small intestine at an earlier stage of digestion. The intestines sense that this food mass is too concentrated, which causes the release of gut hormones. Your body reacts by shifting fluid circulating in your bloodstream to the inside of your intestine. As a result, your intestines become fuller and bloated. Diarrhea often occurs 30 to 60 minutes later. In addition, certain substances are released by your intestine that affect heart rate and often blood pressure, causing many of the symptoms of early dumping. This can lead to lightheadedness or even fainting.

Symptoms of late dumping happen because of a decrease in blood sugar level (reactive hypoglycemia). Reactive hypoglycemia is low blood sugar caused 1 to 3 hours after a large surge of insulin. You are more likely to have dumping syndrome if you eat a meal heavy in starches or sugars. The sugars can be either fructose or table sugar (sucrose). Insulin levels can increase to high levels, and then lower your blood sugar too much.

Dumping syndrome occurs in about 2 to 5 out of 10 people who have had gastric surgery. How bad the symptoms are is based on the extent of the surgery.

Most people have symptoms of early dumping. Early dumping symptoms include:

• Bloating.
• Sweating.
• Abdominal (belly) cramps and pain.
• Nausea.
• Facial flushing.
• Stomach growling or rumbling.
• An urge to lie down after the meal.
• Heart palpitations and fast heartbeat.
• Dizziness or fainting.
• Diarrhea.
• Feeling full after eating only a small amount of food.

About 1 out of 4 people have symptoms of late dumping. These occur 1 to 3 hours after a meal. The symptoms of late dumping syndrome include:

• Heart palpitations.
• Sweating.
• Hunger.
• Confusion.
• Fatigue.
• Aggression.
• Tremors.
• Fainting.

Your care team will likely diagnose dumping syndrome based on your symptoms and when they occur. Tell your doctor which foods or liquids give you symptoms. You may also need to have a glucose tolerance test or hydrogen breath test to help your doctor diagnose you.

The main treatments for dumping syndrome include the following changes in your diet:

• Don't drink liquids until at least 30 minutes after a meal.
• Divide your daily calories into 6 small meals.
• Lie down for 30 minutes after a meal to help control the symptoms.
• Choose complex carbohydrates, such as whole grains, fruits, and vegetables.
• Don't eat foods high in simple carbohydrates, such as those made with white flour or sugar.
• Add more protein, fiber, and fat to your meals.
• Stop eating dairy foods if they cause problems.

Another choice is to slow gastric emptying by making your food thicker. Your doctor may advise adding 15 grams of guar gum or pectin to each meal. But many people don't tolerate these additions to their food.

If dietary changes don't help, your doctor may give you some slow-release prescription medicines. In rare cases, these may help, but they often don't work. In severe cases of dumping syndrome, your doctor may suggest tube feeding or corrective surgery.

The symptoms of dumping syndrome can be so distressing that some people severely limit the amount and type of food they eat. This can cause more problems and can even lead to malnutrition. Because of how serious dumping syndrome can become, it's important to talk with your doctor when you first have symptoms.

• Dumping syndrome after gastric bypass surgery is when food gets “dumped” directly from your stomach pouch into your small intestine without being digested. There are two types of dumping syndrome: early and late.
• Early dumping syndrome can occur because of the dense mass of food that gets dumped into your small intestine at an earlier stage of digestion.
• The main treatments for dumping syndrome are changes to your diet.
• Talk with your doctor if you have symptoms of dumping syndrome.
• If the dietary changes don't help, you may need to take slow-release prescription medicine.

Tips to help you get the most from a visit to your doctor:

• Know the reason for your visit and what you want to happen.
• Before your visit, write down questions you want answered.
• Bring someone with you to help you ask questions and remember what your doctor tells you.
• At the visit, write down the name of a new diagnosis and any new medicines, treatments, or tests. Also write down any new instructions your doctor gives you.
• Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are and when they should be reported.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is recommended and what the results could mean.
• Know what to expect if you do not take the medicine or have the test or procedure.
• If you have a follow-up appointment, write down the date, time, and purpose for that visit.
• Know how you can contact your doctor if you have questions, especially after office hours or on weekends and holidays.