Maxillary sinus surgery covers a range of procedures performed on the largest pair of sinuses, the air-filled cavities behind your cheekbones. The most common version today is functional endoscopic sinus surgery (FESS), where a surgeon threads a thin camera through your nostril and widens the sinus’s natural drainage opening. Recovery from a straightforward FESS typically takes one to two weeks before you return to normal activities, though full mucosal healing continues for several weeks beyond that. The term “maxillary sinus surgery” also encompasses balloon sinuplasty, the older open Caldwell-Luc approach, and sinus-lift procedures used for dental implants, each with a distinct recovery profile.
When Surgery Becomes the Right Option
Maxillary sinus surgery is not usually the first step. A 2025 clinical practice guideline published in a major otolaryngology journal emphasizes that before considering surgery, a surgeon should confirm you meet established diagnostic criteria for chronic rhinosinusitis and evaluate your symptoms, disease characteristics, quality of life, and what medical treatments you have already tried.1PubMed. Clinical Practice Guideline: Surgical Management of Chronic Rhinosinusitis That same guideline makes an important distinction: a surgeon should not require you to complete a rigid checklist of medications, such as a set number of antibiotic courses, before agreeing to operate. Some disease subtypes respond poorly to medication from the start, and delaying surgery for patients who clearly have nasal polyps, fungal balls, or eosinophilic mucin offers little benefit.
Chronic rhinosinusitis with ongoing congestion, facial pressure, and thick drainage that persists for twelve weeks or more is the most frequent reason for maxillary sinus surgery. But dental problems are a surprisingly common trigger. Close to 30 percent of unilateral maxillary sinusitis cases may trace back to an underlying dental issue, such as a periapical infection at the tip of an upper molar root.2PubMed Central. Odontogenic maxillary sinusitis: A comprehensive review When a tooth infection spreads upward into the sinus floor, the sinusitis often does not resolve with standard nasal treatments alone, and a dental procedure or combined surgical approach may be needed. Research using cone-beam CT imaging has confirmed a statistically significant link between teeth with periapical lesions and thickening of the sinus membrane.3Journal of Contemporary Medicine. Evaluation Of The Frequency, Localization And Relationship Of Maxillary Sinus Pathologies With Dental Pathologies By Cone Beam Computed Tomography (CBCT)
Less common but well-recognized indications include fungal balls (dense clumps of fungal material that accumulate inside the sinus), cysts, tumors, and foreign bodies. Fungal balls are treated primarily with surgery to remove the mass, because antifungal medications alone do not clear them.4PubMed. Fungal ball of the maxillary sinus and the risk of persistent sinus dysfunction after simple antrostomy
The Main Surgical Approaches
Several techniques can be used depending on the problem, and a surgeon sometimes combines more than one during the same operation.
Functional Endoscopic Sinus Surgery
FESS is the workhorse of modern sinus surgery. A rigid endoscope is passed through the nose, and the surgeon enlarges the maxillary sinus’s natural drainage pathway, called the antrostomy. There are no external incisions and no visible scars. The goal is to restore airflow and mucus drainage so the sinus can heal itself. Though the endoscopic middle-meatal antrostomy is one of the most commonly performed endoscopic procedures, creating a lasting opening that works with the sinus’s natural drainage pattern requires precise technique, and failed antrostomies needing revision are not unusual at referral centers.5Laryngoscope. Endoscopic maxillary antrostomy: not just a simple procedure For fungal balls, one innovative variation uses a strip of saline-soaked gauze threaded through the antrostomy into the sinus; the gauze bulk pushes remaining fungal material out through the enlarged opening, and fragments often cling to the gauze as it is withdrawn.6PubMed Central. “Gauze Technique” in the Treatment of the Fungus Ball of the Maxillary Sinus: A Technique as Simple as It Is Effective
Balloon Sinuplasty
Balloon sinuplasty is a less invasive alternative for selected patients. A small balloon catheter is guided into the sinus opening and inflated to widen it, then deflated and removed. No tissue is cut or permanently removed. A meta-analysis comparing balloon catheter dilation to conventional FESS found that balloon patients had shorter operating times, fewer complications, and slightly better symptom scores afterward, with no significant difference in the rate of revision surgery between the two groups.7PubMed Central. Efficacy and safety of sinus balloon catheter dilation versus functional endoscopic sinus surgery in the treatment of chronic sinusitis: A meta-analysis A head-to-head study of 75 patients confirmed that balloon sinuplasty involved less blood loss, better post-operative ostium status, and fewer adhesions, though symptom scores were comparable.8PubMed Central. To Determine the Efficacy of Balloon Sinuplasty over Conventional Functional Endoscopic Sinus Surgery Long-term follow-up averaging six years found that both techniques retained their effectiveness and patient satisfaction.9PubMed. Long-term follow-up after ESS and balloon sinuplasty: Comparison of symptom reduction and patient satisfaction Balloon sinuplasty is best suited for limited disease. If you have widespread polyps, thick fungal material, or disease extending beyond the maxillary sinus, conventional FESS offers the surgeon more control.
The Caldwell-Luc Procedure
This older, open approach involves making a small incision under the upper lip and creating a window through the front wall of the maxillary sinus. The surgeon can then directly see and access the entire sinus cavity. Although FESS has replaced the Caldwell-Luc for most routine sinusitis cases, it remains valuable for specific situations: severe facial fractures, removing foreign bodies, closing oro-antral fistulas (holes between the mouth and sinus), and gaining access to surrounding structures like the pterygopalatine fossa or orbital floor.10INDIAN JOURNAL OF APPLIED RESEARCH. CALDWELL LUC APPROACH IN ERA OF ENDOSCOPIC SINUS SURGERY The logic behind the procedure is to remove diseased or scarred sinus lining so new mucosa can regenerate.11PubMed Central. Caldwell Luc Surgery: Revisited Recovery is more involved than with FESS because of the incision and bone removal, with more swelling, potential cheek numbness from infraorbital nerve irritation, and a somewhat longer healing period.
What Happens Before Surgery
A CT scan is almost always obtained before maxillary sinus surgery. Beyond confirming the diagnosis, CT imaging directly shapes the surgical plan. One study found that the extent of FESS correlated with a widely used CT scoring system: patients with higher scores underwent more extensive surgery, and only those with higher scores saw statistically significant long-term improvement.12PubMed. The role of sinus CT in surgical treatment decisions for chronic rhinosinusitis In other words, if your CT shows relatively mild disease, surgery may produce less dramatic benefit than medical therapy, and a careful discussion with your surgeon about realistic expectations is warranted.
Anatomical variations within the sinus drainage pathway also matter. Obstruction of the natural ostium, the small opening through which the maxillary sinus drains, is linked to greater sinus membrane thickening. Certain configurations of the bony structures around the drainage pathway are associated with polypoid thickening and blockage.13PubMed. Association Between Osteomeatal Complex Variations and Maxillary Sinus Membrane Thickness: A CBCT Study Your surgeon uses these imaging findings to anticipate where the blockages lie and how aggressively to address them.
Anesthesia and What Happens During the Procedure
Most endoscopic sinus surgery is performed under general anesthesia, but local anesthesia with sedation is a viable option for many patients. A comparison of the two approaches found that local-with-sedation patients had shorter operative times, shorter recovery-room stays, and lower rates of nausea and vomiting. General anesthesia patients were more likely to have unplanned hospital admissions.14PubMed. Operative times, postanesthesia recovery times, and complications during sinonasal surgery using general anesthesia and local anesthesia with sedation That said, general anesthesia remains the default for more extensive cases and for patients who are anxious about being partly awake. Your surgeon and anesthesiologist will weigh factors like the expected length of the procedure and your medical history.
In complex cases or revision surgeries, surgeons may use image-guided navigation, a system that tracks the position of instruments in real time against your preoperative CT scan. Intraoperative anatomical localization is typically accurate to within about 2 mm.15PubMed Central. Role of Image Guided Navigation in Endoscopic Surgery of Paranasal Sinuses: A Comparative Study The technology is reassuring, but it is not infallible. An analysis of adverse-event reports found that when the navigation system lost accuracy, the risk of the surgeon aborting navigation mid-procedure rose, and the risk of a cerebrospinal fluid leak was substantially elevated compared to other device-related problems.16PubMed. Adverse Events Associated With Image-Guided Sinus Navigation in Endoscopic Sinus Surgery: A MAUDE Database Analysis This is not a reason to avoid navigation, but it underscores that the technology supplements surgical skill rather than replacing it.
The First Days After Surgery
Recovery from endoscopic maxillary sinus surgery is generally manageable, though it is rarely comfortable. Expect congestion, bloody nasal drainage, mild facial pressure, and fatigue for the first several days. Most people take about a week off work.
One of the biggest recovery decisions your surgeon will make is whether to place nasal packing. Packing controls bleeding but makes the first 24 to 48 hours miserable, with significant nasal obstruction and mouth-breathing. A study of 64 patients found that about three-quarters had no packing placed after endoscopic sinus surgery. Those in the no-packing group reported lower nasal obstruction and postnasal drip scores on the first postoperative day, along with less mucosal inflammation.17PubMed. No packing versus packing after endoscopic sinus surgery: pursuit of patients’ comfort after surgery Only one patient in the no-packing group needed packing added later for persistent bleeding. If your surgeon chooses to pack, dissolvable materials are increasingly used so that nothing needs to be physically pulled out.
During the first week, your surgeon will typically ask you to avoid blowing your nose, heavy lifting, and bending forward. Sneezing with your mouth open helps prevent pressure spikes in the sinuses. Blood-tinged drainage is normal for several days. If you had dental-related sinus surgery or a Caldwell-Luc procedure, you may also have swelling along the upper lip and cheek, and the surgeon will likely restrict you to soft foods.
Nasal Irrigation and Ongoing Recovery
Saline nasal irrigation is the cornerstone of postoperative care. Most surgeons instruct you to begin rinsing within a day or two of surgery and continue for weeks to months. Large-volume, positive-pressure irrigations, the kind you do with a squeeze bottle or neti pot, have been shown to deliver solution deeper into the sinuses than sprays.18PubMed Central. Sinonasal Irrigation After Endoscopic Sinus surgery – Past to Present and Future This matters because the whole point of widening the sinus opening surgically is to allow rinses to reach the sinus lining.
Some surgeons prescribe corticosteroid irrigations, where a steroid like budesonide is mixed into the saline. A study of patients with chronic rhinosinusitis who used corticosteroid irrigations after surgery found significant improvements in symptom scores, quality-of-life scores, and endoscopy findings.19PubMed. Corticosteroid nasal irrigations after endoscopic sinus surgery in the management of chronic rhinosinusitis A broader review confirmed that high-volume irrigations with steroids outperformed standard nasal sprays for symptom control after surgery.20PubMed Central. High volume nasal irrigations with steroids for chronic rhinosinusitis and allergic rhinitis If your surgeon prescribes this, using the correct volume and technique matters more than most patients realize. A casual squirt from a small spray bottle does not accomplish the same thing.
You will typically have one or more follow-up visits where the surgeon uses an endoscope to examine the surgical site, suction out crusting and dried blood, and assess healing. These debridement visits can be uncomfortable, but they help prevent scar tissue from closing off the newly widened drainage pathway. Full mucosal healing generally takes six to eight weeks, though you should feel substantially better well before that.
Long-Term Results
One of the most encouraging aspects of maxillary sinus surgery is that the benefits tend to last. A study following 59 adults for an average of nearly 11 years after endoscopic sinus surgery found that quality of life improved significantly within six months and remained durable through the full follow-up period.21PubMed Central. Long-term outcomes of endoscopic sinus surgery in the management of adult chronic rhinosinusitis Another study reported overall surgical success rates above 80 percent at 3, 6, and 12 months, with meaningful drops in symptom scores.22PubMed Central. Evaluating the Efficacy and Trend of Sinus Surgery
Revision surgery remains a reality, though. Some patients develop scarring that closes the antrostomy, polyps regrow, or underlying inflammation recurs. Patients with nasal polyps and those with aspirin-exacerbated respiratory disease tend to have higher revision rates than those with chronic sinusitis alone. If you have had one sinus surgery that failed, the second operation often includes more aggressive tissue removal and may be paired with long-term medical therapy to keep inflammation in check.
Sinus Lift Surgery for Dental Implants
A sinus lift, also called sinus floor elevation, is a fundamentally different procedure from the surgeries described above. It is performed by an oral surgeon or periodontist when there is not enough bone height in the upper jaw to support a dental implant. The floor of the maxillary sinus is gently elevated, and bone graft material is packed into the space created underneath the sinus membrane.23PubMed. Maxillary sinus elevation surgery: an overview
Two main techniques exist. The lateral window approach is similar in spirit to a Caldwell-Luc: the surgeon creates a small window in the side of the upper jaw, lifts the sinus membrane, and fills the space with graft material. The osteotome (closed) technique is more conservative, approaching through the implant site itself and tapping the sinus floor upward. The choice between them depends largely on how much bone you have to start with. Both are considered reliable for building the volume needed to support implants.24PubMed Central. Maxillary Sinus Lift Procedures: An Overview of Current Techniques, Presurgical Evaluation, and Complications
The most common complication of the lateral approach is tearing the Schneiderian membrane, the thin lining of the sinus. Small tears usually heal without trouble, but larger perforations can compromise the graft. Recovery involves similar precautions to standard sinus surgery: no nose-blowing, no straws, no forceful sneezing. The graft typically needs six to nine months to mature before implants can be loaded, though in some cases the implant is placed at the same time as the graft. An important wrinkle is that sinus lift patients can develop chronic sinusitis afterward. One study found that patients who developed symptoms like thick nasal drainage and facial pain, often within three months of implant placement, had typically been through multiple rounds of antibiotics before finally being sent to an ENT specialist.25PubMed Central. Surgical treatment of chronic rhinosinusitis after sinus lift Dynamic navigation systems are now being used in some centers to guide sinus-lift procedures more precisely, with one study reporting clinically acceptable safety and improved accuracy for implant placement in the posterior jaw.26PLOS ONE. The safety of maxillary sinus floor elevation and the accuracy of implant placement using dynamic navigation
When Biologics Enter the Picture
For people with chronic rhinosinusitis and nasal polyps, a class of injectable medications called biologics has changed the conversation about whether surgery is always necessary. Drugs like dupilumab, omalizumab, and mepolizumab target specific immune pathways that drive polyp growth. But the evidence does not suggest biologics have replaced surgery. A comparative analysis found that at 24 weeks, endoscopic sinus surgery produced greater improvements in symptom scores than some biologic trials and resulted in significantly lower polyp scores than both dupilumab and omalizumab, despite comparable improvements in smell.27PubMed Central. A comparative analysis of endoscopic sinus surgery versus biologics for treatment of chronic rhinosinusitis with nasal polyposis
The emerging consensus is that combining the two may work best for difficult cases. A study of patients who had surgery first and then started biologic therapy found a dramatic drop in polyp scores: from about 4.7 before treatment down to 0.09 at 12 months. Patients who received biologics alone saw their polyp scores decrease much less, from about 5.2 to 3.4.28PubMed. Optimizing the timing of biologic and surgical therapy for patients with refractory chronic rhinosinusitis with nasal polyposis (CRSwNP) Surgery debulks the polyps and opens the sinuses, and the biologic then keeps inflammation from rebuilding what was removed. This combination is still evolving, and the cost of biologics (often thousands of dollars monthly) remains a practical barrier for many patients.
Considerations for Children
Endoscopic sinus surgery in children is becoming more common, and one of the main concerns parents raise is whether operating inside a growing face could interfere with normal development. An early animal study found that facial growth was significantly reduced on the operated side in piglets, reaching only about 57 percent of normal in the maxillary sinus region. The same study noted that children younger than nine had immature bone, while those nine and older had predominantly mature bone.29PubMed. Sinus and facial growth after pediatric endoscopic sinus surgery That piglet finding understandably alarmed clinicians, but long-term human data has been more reassuring. A study that followed children who had undergone FESS found no statistically significant difference in facial growth compared to children who had not had surgery, using both quantitative measurements and qualitative assessments.30PubMed. Long-term outcome of facial growth after functional endoscopic sinus surgery A comprehensive review of pediatric sinus anatomy and FESS outcomes echoed that conclusion: despite theoretical concerns, evidence of clinically meaningful facial growth disturbance after surgery remains limited.31PubMed Central. Pediatric paranasal sinuses-Development, growth, pathology, & functional endoscopic sinus surgery
Pediatric sinus anatomy is smaller and still developing, so surgeons tend to operate more conservatively in children, removing less tissue and taking care around growth centers. Most pediatric ENT specialists reserve surgery for children who have truly failed appropriate medical therapy, including treatment of underlying allergies or adenoid hypertrophy, before proceeding. The recovery principles are the same as in adults, saline irrigations and follow-up debridement, though getting a young child to cooperate with a squeeze-bottle rinse can be its own adventure.