Gastric Balloon Risks and Side Effects — Data from 200,000+ Patients

Before deciding about gastric balloon risks, it is important to access accurate data. In this article, we examine the real safety profile of the Allurion Program in light of 200,000+ global placements and peer-reviewed clinical studies.

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Overall Safety Profile

The Allurion swallowable gastric balloon is a device with a broad safety database, with over 200,000 placements worldwide. The key safety finding from this data:

Serious adverse event rate: <0.2%

This rate comes from a 1,770-patient study conducted by Ienca et al. across 19 centers (Obes Surg 2020, PMID: 32279182).

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Expected (Normal) Side Effects

These are an expected part of the Allurion Program and are usually temporary:

The First 1-2 Weeks

• Nausea — the most common complaint; seen in the first days after placement
• Feeling of fullness and discomfort — expected as the balloon fills the stomach's volume
• Reduced appetite — serves the purpose of the program
• Mild abdominal cramps — the stomach adapting to the new situation
• Fatigue — a normal result of calorie restriction

From the Second Week Onward

For the vast majority, these symptoms ease or disappear completely. From approximately the second week onward, the program enters a "normalization" phase.

Individual results may vary. Share your symptoms with your follow-up physician.

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Rare Complications

Early Deflation (Spontaneous Deflation)

The balloon deflating earlier than scheduled. In this case, the balloon is excreted from the digestive system. It is rare; if the balloon deflates early, inform your physician.

Obstruction Risk

The risk of a deflated balloon causing an obstruction in the intestine theoretically exists but is extremely rare. In case of severe abdominal pain or vomiting, you should go to the emergency room.

Hyperinflation

The balloon over-inflating unexpectedly — very rare. Symptom: a sudden increase in bloating and a feeling of pressure.

Situations Requiring Endoscopic Intervention

In very rare cases, the balloon may need to be removed endoscopically. This should be regarded not as an unexpected complication but as a safety mechanism.

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2025 Multicenter Data: Real-World Safety

A recent multicenter study conducted in a community setting has shown that Allurion can be safely administered outside the controlled clinical environment as well (Obes Surg 2025, PMID: 41037243). This "real-world" data reflects a broader patient profile compared to clinical trial conditions.

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Contraindications: Who Is Allurion Not Suitable For?

In the presence of the following conditions, Allurion is not administered (your physician makes the final decision):

Absolute contraindications:

• Pregnancy or breastfeeding period
• Active gastrointestinal bleeding
• Active gastric or duodenal ulcer
• Large hiatal hernia
• Structural esophageal anomalies
• History of gastric surgery (certain types)
• Coagulation disorders

Conditions requiring careful evaluation:

• Inflammatory bowel disease
• Severe kidney or liver failure
• Uncontrolled psychiatric illness
• Use of anticoagulant medication

Eligibility assessment requires a comprehensive medical history and examination.

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Safety Compared to Traditional Balloons

The safety advantage of the Allurion swallowable balloon comes partly from not requiring endoscopy or anesthesia:

• No anesthesia: Zero risk of anesthesia-related complications
• No endoscopy: No risk of endoscopic perforation or aspiration
• No hospital stay: No risk of nosocomial infection

These advantages are especially important for patients at high surgical risk.

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Long-Term Safety: One Year Later

Caballero et al.'s study of 522 patients (PMID: 40676353) extends to 1 year after the balloon is excreted. The findings show the following:

• Weight loss was maintained in 95% of patients
• No long-term serious safety concerns were reported
• The program completion rate is high

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Frequently Asked Questions

Is difficulty swallowing after Allurion normal? There may be mild difficulty swallowing or a feeling of pressure in the throat for the first few days. If it lasts longer than 1-2 days and worsens, call your physician.

Is the balloon noticeable in place? Most patients do not noticeably feel the presence of the balloon from the second week onward.

What should I do if there is a lot of vomiting? Mild vomiting is expected in the first weeks. In case of severe or bloody vomiting, or insufficient food and fluid intake, inform your physician.

Can I consume alcohol? It is recommended that you restrict alcohol intake during the program — both because of the calorie load and the effect on the gastric mucosa.

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Conclusion

Data from 200,000+ placements and peer-reviewed literature show that the Allurion swallowable gastric balloon is a safe treatment option. The serious adverse event rate is <0.2%.

As with every medical procedure, an individual risk assessment is essential. For detailed information and a personal eligibility assessment, consult your specialist physician.

Continue reading:

• Swallowable Gastric Balloon 2026 Comprehensive Guide →
• Has Allurion Been Banned? Current FDA Status →
• Clinical Evidence →
• Find a Specialist →

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This content is for general informational purposes. For a full risk-benefit assessment, be sure to consult your specialist physician. Review Allurion's IFU document for all potential risks.

An Authorized Clinic in a City Near You

You can have the Allurion Program at more than 60 authorized clinics across Türkiye. For clinics in major cities:

• Gastric balloon clinic in İstanbul →
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