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Are there any side effects from bypass surgery?

You may have some side effects after your bypass surgery to treat pancreatic cancer symptoms. You may not get all the side effects listed here.


You may have some pain and discomfort after surgery. You will be given painkillers to manage this, and the pain will improve over time.

Read more about pain following surgery.

Tiredness and fatigue

It may take some time to recover from the surgery, and you may feel tired and weak at first. It may take several weeks to be as active as you were before the operation.

Read more about tiredness and pancreatic cancer.

Sickness after surgery

Sometimes your stomach may take a while to start working again – this is called delayed gastric emptying. This means food will take longer to pass through your stomach, which will make you feel sick. If this happens, it may take a little longer to recover – ask your surgical team about this.

Eating after surgery

After surgery for a blocked duodenum you might need to change your eating habits. For example, you might feel full more quickly, and need to eat smaller meals more often.

Your dietitian will be able to help you with your diet. If you haven’t seen a dietitian, ask to be referred to one. Read more about eating after bypass surgery.

If you have any questions about side effects after bypass surgery, speak to your doctor or nurse. You can also speak to our specialist nurses on our free Support Line.

More information on bypass surgery

What is bypass surgery and when is it used?

What does bypass surgery involve?

Side effects from bypass surgery

Diet after a stent or bypass surgery

Diet and cancer that can't be removed with surgery 

Updated February 2019

Review date February 2021

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