Hernias

Hernias are one of the most common surgical problems I see in patients with obesity — and the relationship between excess weight and hernia development, recurrence, and surgical complexity is one of the most important and underappreciated connections in all of general surgery. As a bariatric surgeon who also manages hernias, I have a unique perspective on how profoundly obesity affects every aspect of hernia disease — from why hernias develop in the first place, to why they are so much harder to repair in obese patients, to why weight loss through bariatric surgery is one of the most important things we can do to improve hernia outcomes and reduce the risk of recurrence. This is a topic I am deeply familiar with and one that deserves a thorough and honest discussion.

Understanding Hernias — What They Are and Why They Matter

A hernia occurs when an organ or tissue pushes through a weakness or defect in the muscular wall that is supposed to contain it. Think of the abdominal wall as a strong, tightly woven fabric — and a hernia as a hole or tear in that fabric through which the internal contents begin to bulge. The abdominal wall is designed to contain and protect the abdominal organs while allowing for the full range of human movement — and when it fails, the consequences can range from a mildly uncomfortable bulge to a life-threatening surgical emergency.

Hernias matter for several important reasons:

• They do not heal on their own — once a defect develops in the abdominal wall, it will not close without surgical intervention and will typically enlarge over time
• They can cause chronic pain, discomfort, and limitation of activity
• They carry the risk of incarceration — when the herniated tissue becomes trapped and cannot be pushed back — and strangulation — when the blood supply to the trapped tissue is cut off, causing tissue death and requiring emergency surgery
• They are significantly more common, more complex, and more likely to recur in patients with obesity

Types of Hernias Most Commonly Seen in Bariatric Patients

Hiatal Hernia

The hiatal hernia deserves special attention in the bariatric surgery context because it is extraordinarily common in obese patients and has a direct and important relationship with bariatric surgical planning.

A hiatal hernia occurs when a portion of the stomach pushes upward through the hiatus — the opening in the diaphragm through which the esophagus passes — into the chest cavity. Normally, the stomach sits entirely below the diaphragm and the hiatus fits snugly around the esophagus, helping to maintain the anti-reflux barrier at the gastroesophageal junction.

When a hiatal hernia is present:

• The lower esophageal sphincter — the valve between the esophagus and stomach — is displaced upward and loses its normal anti-reflux function
• The stomach can slide back and forth between the abdomen and chest, promoting severe acid reflux and GERD
• In large hiatal hernias, a significant portion of the stomach may permanently reside in the chest — causing symptoms of chest pain, difficulty swallowing, and respiratory compromise

Why Obesity Causes Hiatal Hernias:

• Excess intra-abdominal pressure from obesity chronically pushes abdominal contents upward against the diaphragm
• This sustained elevated pressure gradually widens the hiatal opening and weakens the diaphragmatic crura — the muscular pillars that are supposed to hold the hiatus closed around the esophagus
• Over years and decades, the combination of chronic pressure and weakening of the diaphragmatic support structures allows the stomach to herniate upward

Prevalence:

• Studies show that hiatal hernias are present in 40 to 60% of bariatric surgery patients at the time of their procedure
• Many of these patients are completely unaware they have a hiatal hernia — having accepted their chronic heartburn and reflux as simply a normal part of life
• Preoperative upper endoscopy — which I perform routinely in all bariatric patients — identifies hiatal hernias that can then be repaired at the time of bariatric surgery

Repair at the Time of Bariatric Surgery:

• When a hiatal hernia is identified before or during bariatric surgery, I repair it at the same operation — combining the hernia repair with the weight loss procedure
• Hiatal hernia repair at the time of sleeve gastrectomy is particularly important, as an unrepaired hiatal hernia dramatically worsens the reflux that can develop after sleeve gastrectomy
• Simultaneous repair avoids the need for a separate operation, reduces the overall surgical risk compared to two separate procedures, and improves both weight loss and reflux outcomes
• After gastric bypass, the anti-reflux anatomy created by the procedure itself helps prevent hiatal hernia recurrence

Ventral and Incisional Hernias

Ventral hernias are hernias that occur through defects in the front wall of the abdomen. They include:

• Umbilical hernias — occurring through the belly button, extremely common in obese patients due to the chronic elevated intra-abdominal pressure pushing through the natural weakness at the umbilicus
• Epigastric hernias — occurring through the midline above the belly button
• Incisional hernias — occurring through previous surgical incision sites, where scar tissue is inherently weaker than native abdominal wall

Why Obesity Dramatically Increases Ventral Hernia Risk:

Obesity contributes to ventral hernias through multiple powerful mechanisms:

• Dramatically elevated intra-abdominal pressure — the single most important risk factor for ventral hernia development. Excess abdominal fat creates a constant, never-ending outward pressure on the abdominal wall that stresses its weakest points — the umbilicus, the midline linea alba, and any previous incision sites
• Impaired wound healing — obesity significantly impairs wound healing after abdominal surgery through multiple mechanisms including reduced tissue oxygen delivery, impaired immune function, metabolic dysregulation, and the mechanical tension that obesity places on healing incisions
• Chronic straining — obese patients frequently strain during bowel movements, lifting, and other activities — generating repeated pressure spikes that stress abdominal wall integrity
• Weakening of the abdominal wall musculature — the chronic distension and pressure of abdominal obesity weakens and separates the midline abdominal muscles — a condition called diastasis recti — creating a broad structural weakness along the entire midline of the abdomen
• Increased risk after previous abdominal surgery — obese patients who have had prior abdominal operations face dramatically higher rates of incisional hernia than normal-weight surgical patients, due to the combination of impaired wound healing and elevated intra-abdominal pressure

The Incisional Hernia Problem:

Incisional hernias deserve special attention because they represent one of the most significant long-term complications of abdominal surgery in obese patients — and one of the most compelling reasons to lose weight before elective abdominal operations.

Studies show that:

• The incisional hernia rate after abdominal surgery in obese patients can be 2 to 5 times higher than in normal-weight patients
• Large incisional hernias in obese patients are among the most technically challenging operations in all of surgery — requiring extensive abdominal wall reconstruction that carries significant risks of wound complications, mesh infection, and recurrence
• Recurrence rates after incisional hernia repair in obese patients are significantly higher than in normal-weight patients — with many patients requiring multiple re-operations over their lifetime
• The combination of a large hernia, an obese patient, and the need for mesh reinforcement creates a surgical scenario with substantial morbidity that is dramatically improved by achieving weight loss before repair

Inguinal Hernias

Inguinal hernias — occurring in the groin — are the most common type of hernia overall, and they are more common and more complex in obese patients than in normal-weight individuals.

• Direct inguinal hernias — caused by weakness in the posterior wall of the inguinal canal — are directly driven by the elevated intra-abdominal pressure of obesity
• Indirect inguinal hernias — occurring through the internal inguinal ring — are also more common in obese patients
• Inguinal hernia repair in obese patients is technically more challenging due to the excess fat in the groin and preperitoneal space, carries higher rates of wound complications, and is associated with higher recurrence rates than in normal-weight patients
• Weight loss before inguinal hernia repair significantly improves technical ease, reduces complication rates, and lowers recurrence risk

Internal Hernias — A Specific Bariatric Surgery Consideration

Internal hernias are a unique type of hernia that deserves specific discussion in the bariatric surgery context because they are a known complication of gastric bypass surgery — and one that patients and surgeons must be aware of throughout the patient's lifetime.

Internal hernias occur when a loop of small intestine slips through one of the new mesenteric openings — spaces between the bowel and its supporting tissue — created during gastric bypass surgery. The three potential sites of internal hernia after Roux-en-Y gastric bypass are:

• Petersen's space — the space between the Roux limb and the transverse mesocolon
• The jejunojejunal mesenteric defect — the opening in the small bowel mesentery at the jejunojejunostomy
• The transmesenteric defect — present when a retrocolic approach is used

Why Internal Hernias Occur:

• After gastric bypass, the small intestine is rearranged — creating new potential spaces through which bowel loops can herniate
• These mesenteric defects are closed by the surgeon at the time of the original operation — but as patients lose weight, the fat within the mesentery shrinks, potentially allowing these closures to loosen or the spaces to reopen
• This is why internal hernias can occur months or even years after gastric bypass — particularly during and after the period of rapid weight loss

Symptoms of Internal Hernia:

• Intermittent or persistent cramping abdominal pain — often around or after eating
• Nausea and vomiting
• Abdominal distension
• In severe cases — bowel obstruction requiring emergency surgery

This is a critically important point: any gastric bypass patient who develops significant abdominal pain should seek medical attention promptly, as internal hernia can progress rapidly to bowel strangulation and requires urgent surgical intervention. I counsel all of my gastric bypass patients about this risk before surgery and instruct them to go to the emergency room immediately if they develop severe abdominal pain after their procedure.

Prevention:

• Meticulous closure of all mesenteric defects at the time of gastric bypass is the most important preventive measure and is standard practice in my surgical technique
• Sleeve gastrectomy does not create mesenteric defects and therefore does not carry the risk of internal hernia — an important consideration for patients choosing between procedures

How Weight Loss Through Bariatric Surgery Helps with Hernias

The relationship between bariatric surgery and hernia management operates in multiple directions — and understanding the full picture is important for patients with hernias considering bariatric surgery:

Reduces the Risk of New Hernia Development

• By dramatically reducing intra-abdominal pressure, bariatric surgery and weight loss remove the primary mechanical driver of ventral, umbilical, and inguinal hernia formation
• Patients who achieve significant weight loss after bariatric surgery have dramatically lower rates of new hernia development compared to patients who remain obese

Improves the Safety and Outcomes of Hernia Repair

• Weight loss before hernia repair dramatically improves the surgical risk profile and the outcomes of the repair itself
• Lower BMI means less intra-abdominal pressure on the repair, better wound healing, lower infection rates, and significantly reduced hernia recurrence rates
• Many hernia surgeons — myself included — strongly recommend significant weight loss before elective repair of large ventral or incisional hernias in obese patients, as the improvement in outcomes is dramatic and well-documented

Simultaneous Hernia Repair and Bariatric Surgery

• In carefully selected patients, certain hernias — particularly hiatal hernias and smaller umbilical or ventral hernias — can be repaired at the same time as bariatric surgery
• Combining procedures reduces overall operative risk compared to two separate operations, minimizes total anesthesia exposure, and allows the patient to recover from both simultaneously
• The decision to combine procedures depends on the size and complexity of the hernia, the patient's overall health status, and careful surgical judgment about what can be safely accomplished in a single operation
• Larger, more complex hernias — particularly large incisional hernias requiring extensive abdominal wall reconstruction — are generally better addressed as a staged procedure, with bariatric surgery first to achieve weight loss, followed by definitive hernia repair after significant weight loss has been achieved

Reduces Hernia Recurrence

• Hernia recurrence — the hernia coming back after repair — is one of the most frustrating and clinically significant problems in hernia surgery, and obesity is its single most important risk factor
• Studies consistently show that hernia recurrence rates are dramatically higher in obese patients than in normal-weight patients — regardless of the repair technique used
• By achieving and maintaining significant weight loss, bariatric surgery patients dramatically reduce their risk of hernia recurrence after repair — making the investment in weight loss surgery doubly valuable for patients with hernia disease

The Sequencing Question — Bariatric Surgery First or Hernia Repair First?

This is one of the most common and important questions I address when evaluating patients who have both obesity and hernia disease requiring surgical attention. The answer depends on multiple factors and requires individualized assessment, but some general principles apply:

Bariatric Surgery First — Generally Preferred When:

• The hernia is not causing acute symptoms or complications
• The hernia is large and complex — requiring abdominal wall reconstruction that would be technically hazardous and prone to recurrence at the current weight
• The patient has multiple obesity-related comorbidities that would benefit from weight loss before any major abdominal operation
• The hernia can be safely observed while weight loss is achieved

Simultaneous Repair — Appropriate When:

• The hernia is a hiatal hernia — virtually always repaired at the time of bariatric surgery
• The hernia is small and uncomplicated — umbilical hernias under 2 to 3 cm can often be safely repaired at the same time as bariatric surgery
• The repair adds minimal additional operative risk and time to the bariatric procedure

Hernia Repair First — Necessary When:

• The hernia is causing acute incarceration or strangulation — a surgical emergency that cannot wait
• The hernia is causing significant bowel obstruction
• The hernia is large enough to complicate the planned bariatric procedure
• The patient has symptoms that are severe enough to require urgent intervention regardless of weight

The sequencing decision requires careful individualized assessment and open discussion between the patient and surgeon — and it is a conversation I approach thoughtfully with every patient who presents with both obesity and hernia disease.

What the Research Shows

The scientific evidence on the relationship between obesity, bariatric surgery, and hernia outcomes is clear and consistent:

• Studies show that hiatal hernia repair at the time of bariatric surgery significantly reduces postoperative reflux symptoms — particularly after sleeve gastrectomy — compared to sleeve gastrectomy without hiatal hernia repair
• Research consistently demonstrates that hernia recurrence rates are dramatically lower after repair in patients who have achieved significant weight loss compared to patients who remain obese at the time of repair
• Studies examining simultaneous bariatric surgery and umbilical hernia repair show acceptable safety and complication profiles for carefully selected patients with small hernias
• Research on the sequencing of bariatric surgery and complex abdominal wall reconstruction confirms that weight loss before hernia repair significantly improves outcomes — reducing wound complications, mesh infection rates, and recurrence
• Internal hernia rates after gastric bypass are significantly reduced by meticulous mesenteric defect closure — the technique I use routinely in all gastric bypass cases

What This Means for You

If you have a hernia — or if you have had hernia repairs in the past and are concerned about recurrence — and obesity is part of the picture, this conversation is an important one. Here is what I want you to take away:

• Obesity is one of the most powerful drivers of hernia development, complexity, and recurrence
• Hiatal hernias — present in up to 60% of bariatric patients — can be repaired at the time of bariatric surgery, improving both reflux and weight loss outcomes
• Weight loss through bariatric surgery dramatically improves the outcomes of hernia repair and reduces the risk of recurrence
• The sequencing of bariatric surgery and hernia repair requires individualized discussion — and in many cases, achieving significant weight loss first is the safest and most effective strategy
• Internal hernia after gastric bypass is a real risk that requires patient awareness and prompt medical attention if abdominal pain develops

The bottom line: hernias and obesity are deeply interconnected — and bariatric surgery addresses that connection from multiple directions simultaneously. Whether you are trying to prevent new hernias, improve the outcomes of a needed hernia repair, reduce your risk of recurrence after a previous repair, or manage the specific hernia-related considerations of bariatric surgery itself — weight loss is one of the most powerful tools available. That conversation starts here, and I look forward to having it with you.