Gastric Sleeve Surgery: Risks, Complications, and What to Expect After Surgery

What Is Gastric Sleeve Surgery?

Gastric sleeve surgery (sleeve gastrectomy) is one of the most common and effective bariatric weight loss procedures. During surgery, about 80% of the stomach is removed, leaving a smaller, tube-shaped “sleeve.”

This smaller stomach restricts food intake and decreases hunger hormones, helping patients lose a significant amount of weight.

Who Is Eligible?

This procedure is typically recommended for individuals who:

• Have a BMI of 40 or higher
• Have a BMI of 35+ with conditions such as diabetes or sleep apnea
• Have tried traditional weight loss methods without success

Short-Term Risks of Gastric Sleeve Surgery

Like any major operation, gastric sleeve surgery carries surgical and anesthesia-related risks, including:

• Bleeding or infection at the incision site
• Blood clots in the legs or lungs
• Leaks from the staple line where the stomach is cut and sealed
• Breathing difficulties post-surgery
• Adverse anesthesia reactions

Your surgical team will monitor you closely to prevent or manage these complications.

Long-Term Complications to Watch For

Some side effects may develop months or years after surgery, such as:

• GERD (acid reflux) — a common issue after gastric sleeve
• Nutritional deficiencies (vitamin B12, iron, calcium)
• Chronic nausea or vomiting
• Gastrointestinal obstruction or hernias
• Hypoglycemia (low blood sugar)

Routine follow-ups and lifelong supplementation are key to staying healthy after surgery.

Common Side Effects During Recovery

As your body adjusts to rapid weight loss, temporary side effects may include:

• Fatigue and cold sensitivity
• Dry skin or hair thinning
• Muscle aches
• Mood swings
• Changes in taste or appetite

A typical recovery plan includes:

• Liquid and pureed foods for the first few weeks
• Gradual reintroduction of soft, then solid foods
• Daily vitamins and calcium, plus monthly B12 injections

When to Call Your Doctor

Contact your provider if you experience:

• Persistent vomiting or abdominal pain
• Fever, redness, or swelling around the incision
• Signs of dehydration or nutritional deficiency
• Ongoing reflux or difficulty swallowing

Early intervention helps prevent serious complications.

Expert Bariatric Care at BASS Medical Group

At the BASS Medical Group Bariatric Surgery & Weight Management, our board-certified surgeons have performed thousands of successful procedures since 2002—with a complication rate significantly below the national average.

We provide complete pre- and post-operative support, including nutrition counseling, follow-up visits, and emotional support programs.

Call 925-940-1052 or schedule a consultation online to learn whether gastric sleeve surgery is right for you.

Frequently Asked Questions

What are the most common complications after gastric sleeve surgery?‍

Common issues include acid reflux (GERD), nutritional deficiencies, and occasional nausea. Most can be managed with diet, supplements, and medical supervision.

How long is recovery from gastric sleeve surgery?‍

Most patients stay in the hospital for one night and return to normal activities within 2–4 weeks, depending on healing and overall health.