The risks of weight-loss stomach surgery (bariatric surgery) are bleeding, infection and staple line leak in the early period, and reflux, vitamin and mineral deficiencies, and weight regain over the long term. In the literature, serious complication rates are reported to be low — at experienced centers and with appropriate patient selection. Knowing the risks when deciding on surgery is the foundation of patient safety and informed consent. In this article, we explain the possible risks, how often they occur, and the precautions taken in a neutral way.
Placing the risks in the right frame
Obesity is associated with serious health problems such as type 2 diabetes, hypertension, sleep apnea and cardiovascular disease (WHO obesity data). For this reason, risk assessment is not one-sided: the risks of surgery are considered together with the long-term risks of untreated obesity. International guidelines (ASMBS/IFSO 2022) assess the benefit-risk balance of surgery favorably in patients who meet the appropriate criteria. The final decision is made through a personalized examination.
Early-period (perioperative) risks
| Risk | Description and frequency in the literature |
|---|---|
| Bleeding | May occur during or after surgery; reported at around 1-2% in the literature, and most cases are managed without an additional procedure. |
| Staple line leak | Leakage from the incision line; reported below 1-2% after a gastric sleeve. Close in-hospital monitoring is carried out for early diagnosis. |
| Infection | Incision-site or intra-abdominal infection; the risk is reduced with prophylactic antibiotics and sterile protocols. |
| Thromboembolism (clot) | The risk of a clot in the leg veins traveling to the lungs; managed with early mobilization, compression and, when needed, medication protection. |
| Anesthesia-related risks | Obesity can affect anesthesia risk; a preoperative anesthesia assessment is therefore mandatory. |
In the literature, mortality after bariatric surgery is reported in the range of 0.1-0.3%; this rate is comparable to many common abdominal operations.
Long-term risks
- Reflux: After a gastric sleeve, new-onset or increased reflux can appear in a group of patients. In a history of severe reflux, the physician evaluates the choice of method accordingly.
- Vitamin and mineral deficiencies: Deficiencies in vitamin B12, vitamin D, iron and calcium may develop; these are managed with regular blood tests and supplementation.
- Weight regain: Partial regain can be seen over the long term; it is related to dietary adherence and activity. Our nutrition guide offers guidance on this topic.
- Gallstones: Gallstone formation can occur during periods of rapid weight loss; it is treated if it becomes symptomatic.
- Stomach narrowing (stricture): Rare; it can be treated with endoscopic methods.
What is done to reduce the risks?
- Before surgery: Comprehensive workup (blood tests, endoscopy, imaging), anesthesia and any necessary specialist consultations, and advice to stop smoking.
- During surgery: Laparoscopic technique, a properly equipped operating room and an experienced team.
- After surgery: Close in-hospital monitoring (2-3 days), early mobilization, clot protection, a gradual nutrition plan and regular check-ups.
When should you seek medical care?
After discharge, in the case of severe abdominal pain, a fever above 38°C, palpitations, shortness of breath, vomiting together with a general decline in your condition, or increasing redness and discharge at the incision site, you should contact your clinic or go to the emergency department without delay. Early reporting allows potential problems to be resolved while they are still small.
Let's Evaluate the Risks Together
Your personal risk profile only becomes clear through an examination and tests. You can schedule an initial consultation for your questions.
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