After gastric bypass surgery for weight loss, the new connection between the stomach pouch and the small intestine may narrow. This is called an anastomotic stenosis. It's also known as a stricture.

It's not clear why stenosis occurs after gastric bypass surgery. But it is most likely to occur 3 to 4 weeks after the surgery. A few things may raise the risk for stenosis, including:

• The use of staples, especially circular staples, rather than stitches
• Scarring
• Not enough blood flow to the area
• Sores (ulcers) at the anastomosis caused by smoking or taking aspirin or nonsteroidal anti-inflammatory medicines (NSAIDs) too often

The symptoms of stenosis can include:

• Nausea
• Vomiting of undigested food, especially right after eating
• Trouble swallowing
• Feeling of fullness in the upper middle abdomen after eating that lasts a long time
• Trouble eating certain foods

Your doctor will assess your symptoms and give you a physical exam. You may have a test called an upper GI series. This test uses X-rays and contrast dye that you swallow. It can show if there is a stricture. Or you may have an upper GI endoscopy so your doctor can look at the area.

During an upper endoscopy, your doctor will inflate a special balloon at the anastomosis. The opening will be stretched back to its original size, if possible. This is called endoscopic dilation. In some cases, you may need more surgery to fix problems related to the stenosis. You may also need to take proton pump inhibitor (PPI) medicine to reduce your stomach acid.

To help prevent stenosis, follow your doctor's directions about when and what to eat after gastric bypass surgery. Talk with your doctor about your use of aspirin or nonsteroidal anti-inflammatory medicines. And don't smoke. If you need help quitting, talk with your doctor.

• After gastric bypass surgery for weight loss, the new connection between the stomach pouch and the small intestine may narrow. This is called an anastomotic stenosis.
• It's not clear why stenosis occurs after gastric bypass surgery.
• Smoking and taking nonsteroidal anti-inflammatory medicines can make it more likely for you to develop stenosis. If you smoke and need help to stop, ask your doctor about smoking cessation programs.
• The simplest way to fix stenosis is with a procedure called endoscopic dilation.
• To help prevent stenosis, follow your doctor's advice on when and what to eat.

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.
• Ask if your condition can be treated in other ways.
• Know why a test or procedure is advised 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 and on weekends and holidays.