Complications of Gastric Bypass Surgery

Reviewed by: Peter F. Rovito, MD, FACS

Complications of gastric bypass surgery:

  • Are almost never life-threatening (gastric bypass has a 99.8% survival rate)
  • Occur in up to 10% patients (9 out of 10 patients do not experience complications)
  • Include 20 possible issues
  • Can often be avoided with the right behavior and choices

Read and click the sections below for everything you need to know about gastric bypass complications.

01 General Safety

General Safety

Very safe: 99.8% survival rate Click here to compare to other common procedures

Compare the 0.22% mortality rate (99.8% survival rate) of gastric bypass surgery to other well-known procedures:

  • Gallbladder removal: 0.15% mortality rate (1)
  • Hip replacement: 0.29% mortality rate (2)
  • Cesarean section (“C-Section”): 0.40% mortality rate (3)

In other words, gastric bypass is about as risky as gallbladder surgery and a lot less risky than a hip replacement or a C-section.

Typical gastric sleeve results include:

  • 1-year weight loss: 65% of excess weight, on average
  • 5-year weight loss: 60% of excess weight, on average, after weight regain
  • Complete resolution or significant improvement for at least 15 obesity-related health conditions, including diabetes, hypertension, and sleep apnea

See our Gastric Bypass Results section for more information about weight loss and health benefits to expect.

02 Complication Rates

Complication Rates

Up to 10% of patients have at least one complication

Complications of gastric bypass surgery occur in up to 10% of patients, as evidenced by the following two studies:

Study
Study
Study A
Study A
Study B
Study B
Study C
Study C
Study
# of gastric bypass patients in study
Study A
1,573
Study B
111
Study C
70
Study
Complication Rate
Study A
At least one complication – 9.5%
Study B
Early complications – 10% Late complications – 15.3%
Study C
Early complications – 10% Late complications – 8.1%
Study
Year
Study A
2016
Study B
2007
Study C
2006
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03 List of Complications

List of Complications

20 potential complications

The following list of gastric bypass complications may appear intimidating, but keep in mind that 9 out of 10 patients don’t experience any complications and that there are several things you can do to minimize your risk.

Further down the page we’ll direct you to resources that will help you find, interview and choose the right bariatric doctors and help you understand how to minimize your risks.

First, let’s review the list of potential complications (click the links below for more information including definitions and treatments, then click the ‘Back’ button in your browser to come back to this page)…

For a complete list and comparison of complications relating to all types of bariatric surgery, see our Bariatric Surgery Complications page.

04 Minimize Your Risk

Minimize Your Risk

Tips and resources Choose the right surgeon

We have several pages that will help you determine the best way to reduce your risk during and after gastric bypass surgery. Follow one of the below links depending on where you are in the process:

  • Your first step is to make sure that you select the surgery that is most appropriate for your situation. Different surgeries carry different risks for different people. Our Types of Bariatric Surgery page compares and contrasts the safest and most effective procedures.
  • If you haven’t done so already, next review our Bariatric Surgery Complications page. In addition to providing a full list of definitions and treatments, it also illustrates which complications apply to each type of surgery, factors that increase your risks and 10 ways to minimize your risk of complications.
  • As mentioned above, your surgeon can have a lot to do with your outcome. For example, one study evaluated a surgeon over his first 300 laparoscopic gastric bypass patients (2). Following were his results as he gained experience:
Group
Group
First 100 patients
First 100 patients
Second 100 patients
Second 100 patients
Third 100 patients
Third 100 patients
Group
Time in surgery
First 100 patients
163 minutes
Second 100 patients
119 minutes
Third 100 patients
94 minutes
Group
Number of reoperations
First 100 patients
9
Second 100 patients
2
Third 100 patients
1
Group
Number of conversions to open surgery
First 100 patients
2
Second 100 patients
1
Third 100 patients
1

Obviously, being in the 3rd group is the most desirable.

A separate and much larger study of over 15,000 patients in Michigan had similar findings about surgeon experience (3):

# of procedures performed by surgeon over 3 years
# of procedures performed by surgeon over 3 years
Less than 100 cases
Less than 100 cases
100 – 249 cases
100 – 249 cases
Greater than or equal to 250 cases
Greater than or equal to 250 cases
# of procedures performed by surgeon over 3 years
Rate of serious complications occuring within 30 days of surgery
Less than 100 cases
3.8%
100 – 249 cases
2.4%
Greater than or equal to 250 cases
1.9%

Most surgeons offer free seminars that teach you about your weight loss surgery options and their offices experience, total procedures performed and specific results. The seminars also allow you to get to know the surgeon prior to a one-on-one consultation (usually free as well).

Click here to find and schedule a free in-person seminar or one-on-one consultation with a qualified weight loss surgeon in your area.

You can also review our Bariatric Doctors page to learn how to interview multiple doctors and choose the best one.

05 Help & Support

Help & Support

Ask the expert Patient experiences

Ask the Expert & Patient Experiences*

We would love to hear your experiences with gastric bypass complications. Your insights are invaluable to making sure other people have the tools to meet their goals.

We would also be happy to answer any questions you may have about gastric bypass complications.

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Questions From Other Visitors*

Click below to see contributions from other visitors to this page…

Weak, Lethargic, Tired & Depressed After Gastric Bypass Surgery*

My gastric bypass was done on March 25, 2013. That's almost five weeks out. I'm writing because I feel weak, lethargic, an over-whelming urge to sleep. About 7 days out…


Light-headed and dizzy after gastric bypass surgery*

Has any one had issues with light headedness or dizzyness after gastric bypass surgery? Could it be a vitamin issue or diet issue? It is concerning me because of how…


No Weight Loss After Roux en Y Gastric Bypass Surgery*

I received Roux en Y gastric bypass surgery and did not lose weight. My doctor ordered an upper GI and determined that my anastomosis was too large and the food…


Risk of Blood Clots After Gastric Bypass Surgery*

My husband and I will be taking care of our 32-year old son after roux-en-y gastric bypass surgery and are trying to learn as much as possible. He is 5'…


Pain in Upper Right Quadrant 9 Days After Gastric Bypass Surgery*

I am 9 days post-op from RNY gastric bypass. At the time of surgery they had to take down a Nissen from 2005 and re-repair a hiatal hernia (also repaired…


Hypoglycemic 8 Years After Bariatric Surgery*

I have been slowly gaining weight back for about the last 6 months ago when I started to have low blood sugar... I have had to eat more sugar to…


Gastric Pouch Emptying Too Fast & Gaining Weight Back*

I am 17 yrs. out from my gastric bypass surgery. I started at 306 lbs (139 kgs) and got down to 175 lbs (79 kgs). I have been gaining weight…


Hair Loss After Gastric Bypass Surgery*

My gastric bypass surgery was March 25, and I've been noticing when I comb or brush my hair, it comes out. While my hair does not come out "in clumps",…


Gastric Bypass Patient Gets Hiccups After Eating*

My wife had gastric bypass surgery and now gets hiccups after eating. Why is this happening?Is there any way to prevent it?


Excessive Diarrhea After Gastric Bypass*

I had gastric bypass surgery in 2006 and I have had severe diarrhea ever since. I later found out that I only have about 11 inches of intestines and I…


Is Your Gastric Bypass Pouch Still Working Properly?*

I had gastric bypass surgery six years ago. Sometimes I feel like maybe it's not working as it used to. How can you tell if it's still working properly? Is…


Dental problems after gastric bypass surgery*

In November 2002 I was miserable and in a lot of pain. I weighed 325 lb., 5'6" with fibromyalgia & chronic fatigue, constant migraines and difficultly sleeping. I decided to…


Hot & Warm Food Makes Gastric Bypass Patient Vomit*

It has been 6 years and -150 lbs. maintained since the Roux En Y gastric bypass. If I am served a meal at a restaurant or heat my soup too…


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[ Last editorial review/modification of this page : 03/31/2017 ]

* Disclaimer: The information contained in this website is provided for general information purposes and your specific results may vary depending on a variety of circumstances. It is not intended as nor should be relied upon as medical advice. Rather, it is designed to support, not replace, the relationship that exists between a patient/site visitor and his/her existing physician(s). Before you use any of the information provided in the site, you should seek the advice of a qualified medical, dietary, fitness or other appropriate professional. Read More