Back pain after gastric sleeve surgery is a common concern that many patients experience during their recovery. Sleeve gastrectomy is a major bariatric procedure that places significant demands on the body, and discomfort in the back can arise from a range of causes — including surgical positioning, residual laparoscopic gas, nutritional deficiencies, and postural changes as the body adapts to rapid weight loss. Understanding why back pain occurs, how to manage it safely, and when to seek medical advice is essential for a smooth and informed recovery following bariatric surgery.

Why Back Pain Can Occur After Gastric Sleeve Surgery

Back pain after sleeve gastrectomy commonly results from prolonged surgical positioning, referred pain from laparoscopic carbon dioxide gas, and the body adapting to rapid shifts in weight, posture, and spinal loading.

Gastric sleeve surgery, formally known as sleeve gastrectomy, is a major bariatric procedure that removes approximately 75–80% of the stomach, leaving a narrow, sleeve-shaped pouch. While the surgery is primarily performed to achieve significant and sustained weight loss, it places considerable physiological demands on the body — both during the procedure itself and throughout the recovery period. Back pain is not uncommon in the weeks and months following surgery, and understanding why it occurs is an important part of managing your recovery safely.

During the operation, patients are positioned under general anaesthesia for an extended period, typically in a supine or slightly reclined position. This prolonged positioning can place mechanical stress on the lumbar spine and surrounding musculature, leading to post-operative muscle soreness and stiffness. Additionally, the use of laparoscopic instruments requires the surgical team to insufflate the abdomen with carbon dioxide gas. This most commonly causes referred pain to the shoulder tips as the gas dissipates in the days following surgery; some patients also notice discomfort in the upper back, though this is less typical.

It is also worth noting that many individuals who undergo bariatric surgery have pre-existing musculoskeletal conditions, including chronic lower back pain associated with obesity. The shift in body weight, posture, and centre of gravity that follows rapid weight loss can temporarily alter spinal loading patterns, which may initially exacerbate rather than relieve back discomfort. This does not mean surgery has caused harm — rather, the body is adapting to significant anatomical and physiological changes.

Common Causes and Contributing Factors

Causes include positional strain, nutritional deficiencies (particularly vitamin D and calcium), postural and biomechanical changes, gallstone disease, and renal colic — all of which should be considered when assessing post-operative back pain.

Back pain after gastric sleeve surgery can arise from a variety of causes, some directly related to the procedure and others linked to the broader process of post-operative recovery and weight loss. Identifying the likely contributing factors can help guide appropriate management.

Surgical and procedural factors include:

• Positional strain from prolonged time on the operating table

• Referred pain from residual carbon dioxide gas used during laparoscopy (most commonly felt at the shoulder tips; upper back discomfort can also occur)

• Wound-related discomfort that may radiate to the back, particularly from port sites on the left side of the abdomen

Nutritional deficiencies are an important and sometimes overlooked cause. Sleeve gastrectomy is primarily a restrictive procedure; unlike gastric bypass, significant malabsorption is not a major feature. However, micronutrient deficiencies — particularly in vitamin D, calcium, iron, vitamin B12, and folate — can still develop due to reduced dietary intake and changes in gastric physiology (including reduced acid production and altered intrinsic factor availability). Vitamin D and calcium deficiency in particular are associated with musculoskeletal pain, bone density loss, and generalised aching that patients may describe as back pain. The British Obesity and Metabolic Surgery Society (BOMSS) recommends lifelong nutritional supplementation and regular monitoring following bariatric surgery for this reason.

Postural and biomechanical changes also play a significant role. As body weight decreases, the spine and supporting muscles must adapt to a new load distribution. Core muscles that were previously deconditioned may struggle to support the spine adequately during this transition, contributing to lower back strain.

Other potential causes that should not be overlooked include:

• Gallstone disease: Rapid weight loss significantly increases the risk of gallstone formation, which can cause pain in the right upper abdomen, right shoulder blade, or back

• Renal colic: Kidney stones can present with flank or back pain and may occur following bariatric surgery

• Psychological factors such as post-operative anxiety, disrupted sleep, and reduced physical activity during recovery can lower pain thresholds and amplify the perception of musculoskeletal discomfort

Sleeve gastrectomy is not typically associated with serious spinal pathology, but any persistent or worsening back pain should always be assessed by a healthcare professional to identify the underlying cause.

When to Seek Medical Advice

Seek emergency care immediately for saddle anaesthesia, leg weakness, or breathlessness; contact your GP or bariatric team promptly for severe, worsening, or persistent back pain lasting more than four to six weeks.

Mild to moderate back pain in the first few weeks after gastric sleeve surgery is common and, in most cases, resolves as the body heals and adapts. However, there are specific symptoms and circumstances that warrant prompt medical attention. Knowing when and how to seek help is an essential part of safe post-operative care.

Call 999 or go to your nearest A&E immediately if you experience:

• New difficulty urinating, loss of bladder or bowel control, numbness or tingling in the inner thighs or groin (saddle area), or rapidly progressive weakness in both legs — these may indicate cauda equina syndrome, a neurological emergency

• Sudden breathlessness, chest pain, coughing up blood, or significant swelling or pain in one leg — these may indicate a pulmonary embolism (PE) or deep vein thrombosis (DVT), which are recognised risks in the post-operative period

Contact your GP or bariatric team promptly if you experience:

• Back pain that is severe, sudden in onset, or rapidly worsening

• Pain accompanied by fever, chills, or signs of infection

• Pain that radiates down one or both legs (sciatica-like symptoms)

• Persistent back pain lasting more than four to six weeks without improvement

• Back pain accompanied by nausea, vomiting, or abdominal symptoms, which could indicate a surgical complication such as a staple-line leak or abscess — though rare, these can present with back or flank pain

• Right-sided upper abdominal pain radiating to the shoulder blade or back, which may suggest gallstone disease

• Severe loin-to-groin pain, which may suggest renal colic

If you are unsure whether your symptoms require urgent attention, contact NHS 111 for advice at any time.

In the immediate post-operative period (within the first two weeks), any new or escalating pain should be reported to your surgical team without delay. For patients with pre-existing back conditions, it is advisable to inform both your bariatric team and your GP so that a coordinated plan can be put in place. Your bariatric nurse specialist or physiotherapist can also provide guidance on safe movement and activity levels during recovery.

Managing Back Pain During Your Recovery

Paracetamol is the preferred analgesic; NSAIDs should be avoided after bariatric surgery. Gentle mobilisation, physiotherapy, and adherence to prescribed nutritional supplements are the cornerstones of conservative management.

For most patients, back pain after gastric sleeve surgery is manageable with conservative measures and resolves within a few weeks. A structured, stepwise approach to pain management — guided by your clinical team — is recommended.

Pain relief: Simple analgesia such as paracetamol is generally considered safe and effective for mild to moderate post-operative back pain. Non-steroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen should be avoided following bariatric surgery where possible, due to the increased risk of gastric ulceration and staple-line complications. If an NSAID is considered clinically necessary by your GP or bariatric team, it should be used at the lowest effective dose for the shortest possible duration, alongside a proton pump inhibitor (PPI) for gastroprotection. Many bariatric programmes routinely prescribe a PPI for several months after sleeve gastrectomy — continue this as directed by your surgical team. Topical NSAIDs or heat therapy may offer localised relief with a lower systemic risk in some cases. Always consult your bariatric team or GP before taking any new medication. If you experience a suspected side effect from any medicine, you can report it via the MHRA Yellow Card scheme at yellowcard.mhra.gov.uk.

Experiencing these side effects? Our pharmacists can help you navigate them →

Gentle movement and physiotherapy: Early, gentle mobilisation is encouraged following surgery and is beneficial for both recovery and back pain management. Prolonged bed rest is not recommended, as it can worsen musculoskeletal stiffness and delay healing. A referral to a physiotherapist — available through your GP or bariatric programme — can provide a tailored exercise plan that safely strengthens the core and supports spinal health without placing undue strain on healing tissues.

Nutritional support: Ensuring adequate intake of prescribed supplements is critical. In line with BOMSS guidance, your bariatric team will typically recommend:

• A complete multivitamin and mineral supplement containing iron, folic acid, and B vitamins

• Calcium and vitamin D supplementation — in UK practice this is commonly provided as calcium carbonate with vitamin D (e.g., Adcal-D3); calcium citrate may be considered in patients who are intolerant of carbonate or who are taking long-term PPIs

• Vitamin B12 — many UK bariatric programmes recommend routine intramuscular vitamin B12 injections following sleeve gastrectomy; confirm the approach recommended by your own team

Regular blood tests are an important part of your post-operative follow-up. BOMSS guidance recommends monitoring at approximately 3, 6, and 12 months after surgery, and annually thereafter. Tests typically include full blood count, ferritin, vitamin B12, folate, calcium, vitamin D, parathyroid hormone (PTH), urea and electrolytes, and liver function tests, with additional trace element testing as clinically indicated. These tests help identify and correct any deficiencies that may be contributing to musculoskeletal symptoms.

Posture and ergonomics: As your weight changes, paying attention to posture — particularly when sitting for extended periods — can reduce spinal strain. Supportive seating, regular position changes, and avoiding heavy lifting in the early recovery phase are all practical measures that can make a meaningful difference to day-to-day comfort.

Long-Term Outlook and Prevention After Bariatric Surgery

Significant weight loss following sleeve gastrectomy is associated with long-term reduction in chronic back pain; lifelong supplementation, regular monitoring, physical activity, and bariatric follow-up are key to sustaining musculoskeletal benefits.

The long-term outlook for back pain following gastric sleeve surgery is, for many patients, genuinely positive. Evidence from systematic reviews and large cohort studies suggests that significant weight loss following bariatric surgery is associated with a reduction in chronic musculoskeletal pain, including lower back pain, over time. As excess body weight is lost, the mechanical load on the lumbar spine decreases, obesity-related inflammation diminishes, and mobility typically improves — all of which contribute to better spinal health.

However, achieving these benefits requires ongoing commitment to the lifestyle changes that support long-term bariatric success. Key preventive strategies include:

• Regular physical activity: Low-impact exercise such as walking, swimming, and cycling supports weight maintenance, strengthens core and back muscles, and improves overall musculoskeletal function. NHS guidelines recommend at least 150 minutes of moderate-intensity activity per week for adults, alongside muscle-strengthening activities on two or more days per week.

• Lifelong nutritional supplementation and monitoring: Bone health is a particular concern following sleeve gastrectomy. Vitamin D and calcium deficiency can contribute to bone density loss and increased fracture risk over time. Micronutrient monitoring should follow BOMSS guidance. Fracture risk should be assessed using validated tools (such as FRAX or QFracture) in line with NICE osteoporosis guidance; DEXA scanning is recommended for patients identified as being at elevated risk, rather than routinely for all bariatric patients.

• Maintaining a healthy weight: Weight regain following bariatric surgery can reverse the musculoskeletal benefits achieved. Ongoing support from a bariatric dietitian and psychological services, where available, can help sustain long-term outcomes.

• Engaging with follow-up care: Attending scheduled post-operative appointments with your bariatric team allows for early identification and management of nutritional deficiencies, postural issues, and any emerging musculoskeletal concerns.

In summary, whilst back pain after gastric sleeve surgery is a recognised and often temporary challenge, it is manageable with the right support. Patients who engage actively with their post-operative care, maintain adequate nutrition, and adopt a physically active lifestyle are well-placed to experience meaningful and lasting improvements in both their weight and their musculoskeletal health.

Frequently Asked Questions