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Risks and Complications of Gastric Sleeve Surgery
Risks and Complications of Gastric Sleeve Surgery
Gastric sleeve surgery is a well-established bariatric procedure, but like every operation it carries potential risks and complications. Most patients recover without serious problems, but understanding possible complications is an important part of making an informed decision.
Risk varies from person to person and depends on factors such as age, BMI, existing medical conditions, previous surgery, smoking status and the overall surgical and anaesthetic assessment.
Main Gastric Sleeve Risks and Complications
Potential complications include bleeding, staple-line leakage, infection, blood clots, stomach narrowing, reflux, dehydration and nutritional deficiencies. Individual risk varies according to factors such as BMI, age, existing medical conditions, previous surgery and the overall surgical and anaesthetic assessment.
What Are the Main Risks of Gastric Sleeve Surgery?
Possible complications can be divided into general surgical risks, early sleeve-specific complications and longer-term problems.
Potential risks include:
- Bleeding
- Staple-line leakage
- Infection
- Blood clots
- Adverse reactions to anaesthesia
- Stomach narrowing or stenosis
- Acid reflux
- Dehydration
- Vitamin and mineral deficiencies
- Weight regain over time
The presence of a possible risk does not mean that a complication will occur. Careful assessment, surgical technique and structured follow-up all play an important role in reducing risk.
Concerned About Your Personal Risk?
Your individual risk depends on more than BMI alone. Age, medical conditions, previous surgery, medications and smoking history can all affect the assessment. Send us your health information and our team can review which factors may be relevant in your case.
What Is a Staple-Line Leak?
A staple-line leak occurs when stomach contents escape through a weakness in the staple line created during sleeve gastrectomy.
Although uncommon, it is one of the most important complications because it may lead to infection or inflammation inside the abdomen.
Possible warning signs can include:
- Increasing abdominal pain
- Fever
- Rapid heart rate
- Shortness of breath
- Persistent nausea or vomiting
- A general deterioration in how the patient feels
Early recognition is important, so patients should receive clear instructions about who to contact if concerning symptoms develop after discharge.
Can Bleeding Occur After Gastric Sleeve Surgery?
Bleeding can occur during or after gastric sleeve surgery. It may come from the staple line, abdominal tissues or another surgical site.
Minor bleeding may resolve with observation, while more significant bleeding may require medication, blood transfusion, endoscopy or further surgery depending on the clinical situation.
Signs that may require assessment include dizziness, weakness, rapid heart rate, falling blood pressure or visible bleeding.
What Is Gastric Sleeve Stenosis?
Stenosis, or narrowing of the stomach, can occur if part of the sleeve becomes too narrow or develops abnormal angulation.
Symptoms may include:
- Difficulty tolerating food or liquids
- Persistent vomiting
- Upper abdominal discomfort
- Difficulty maintaining adequate hydration
Evaluation may include imaging or endoscopy. Treatment depends on the cause and severity of the narrowing.
Can Gastric Sleeve Surgery Cause Acid Reflux?
Yes. Gastric sleeve surgery can worsen pre-existing reflux or cause new gastroesophageal reflux disease (GERD) in some patients.
Symptoms may include heartburn, regurgitation, chest discomfort or a sour taste in the mouth.
Patients with significant reflux or a large hiatal hernia should be assessed carefully before surgery because another bariatric procedure may be more appropriate in selected cases.
You can read more in our comparison of gastric sleeve vs gastric bypass.
Do You Have Reflux or a Hiatal Hernia?
Reflux symptoms and hiatal hernia can influence which bariatric procedure may be more appropriate. If you have heartburn, regurgitation or a known hiatal hernia, tell us before surgery so your case can be assessed individually.
What Is the Risk of Blood Clots?
Obesity and surgery both increase the risk of venous thromboembolism, including deep vein thrombosis and pulmonary embolism.
Preventive measures may include:
- Early mobilisation
- Compression devices
- Anticoagulant medication when indicated
- Adequate hydration
The exact prevention strategy should be based on the patient’s individual risk profile.
Can Infection Occur After Gastric Sleeve Surgery?
Infection may occur at an incision site or inside the abdomen, particularly if another complication such as a leak is present.
Possible symptoms include fever, redness, swelling, wound discharge or increasing pain.
Any suspected infection should be assessed promptly so that appropriate treatment can begin.
Can Dehydration Occur After Surgery?
Dehydration is relatively common in the early post-operative period because patients can only drink small amounts at a time.
Symptoms may include:
- Dark urine
- Dizziness
- Dry mouth
- Weakness
- Reduced urination
Patients are encouraged to sip fluids regularly throughout the day and follow the hydration targets provided by their bariatric team.
Can Nutritional Deficiencies Develop?
Gastric sleeve surgery does not bypass the intestines, but nutritional deficiencies can still develop because food intake is significantly reduced.
Possible deficiencies may involve:
- Iron
- Vitamin B12
- Folate
- Vitamin D
- Calcium
- Protein
Regular blood tests, appropriate supplementation and dietitian follow-up help identify and manage deficiencies early.
What Are the Long-Term Complications of Gastric Sleeve Surgery?
Some complications may develop months or years after surgery rather than during the early recovery period.
Long-term concerns can include:
- Persistent or worsening reflux
- Vitamin and mineral deficiencies
- Changes in eating tolerance
- Gallstones during rapid weight loss
- Weight regain
Ongoing follow-up is important because some problems may develop gradually and initially cause only mild symptoms.
Can Gallstones Develop After Gastric Sleeve Surgery?
Rapid weight loss can increase the risk of gallstone formation. Some patients may develop gallstones during the months following bariatric surgery.
Gallstones do not always cause symptoms, but they may cause pain in the upper abdomen, nausea or vomiting if they become clinically significant.
The need for investigation or treatment depends on the patient’s symptoms and test results.
Can Weight Regain Be Considered a Long-Term Complication?
Some weight regain can occur years after gastric sleeve surgery. This may be related to changes in eating habits, reduced physical activity, increased portion sizes, hormonal changes or other medical factors.
Weight regain does not automatically mean the operation has failed. Early assessment can help identify the cause and determine whether nutritional, behavioural, medical or surgical treatment is appropriate.
Read more about weight regain after gastric sleeve surgery.
What Symptoms Require Urgent Medical Attention?
Patients should seek urgent medical advice if they experience symptoms such as:
- Severe or increasing abdominal pain
- Persistent vomiting
- High fever
- Rapid heart rate
- Chest pain
- Shortness of breath
- Heavy bleeding
- Inability to drink enough fluid
These symptoms do not always indicate a serious complication, but they should not be ignored.
Already Had Gastric Sleeve Surgery and Worried About a Symptom?
If you have recently had surgery and are unsure whether a symptom is normal, contact your treating medical team promptly. For non-emergency questions, you can also send us your surgery date and symptoms so we can understand your situation better.
How Can the Risk of Complications Be Reduced?
Complication risk cannot be eliminated completely, but several measures can help reduce it.
- Detailed pre-operative medical assessment
- Experienced bariatric surgical care
- Appropriate anaesthetic evaluation
- Early mobilisation after surgery
- Blood clot prevention when indicated
- Following the recommended staged diet
- Adequate hydration
- Taking prescribed medication and supplements
- Attending regular follow-up appointments
- Reporting unusual symptoms early
Why Is Follow-Up Important After Gastric Sleeve Surgery?
Follow-up is not only about monitoring weight loss. It also allows the bariatric team to review hydration, nutrition, blood test results, reflux symptoms and any changes in eating tolerance.
Regular follow-up can help identify problems before they become more difficult to manage.
For information about the early recovery period, see our gastric sleeve recovery timeline.
Want to Understand How We Manage Surgical Risk?
If you are comparing gastric sleeve surgery providers, ask about pre-operative testing, hospital care, complication management and long-term follow-up before making your decision.
