Deviated Septum
A deviated septum — also called nasal septal deviation (NSD) — is a displacement of the nasal septum from the midline, creating asymmetry between the two nasal cavities. Some degree of septal deviation is present in up to 80% of the general population and is therefore extremely common, yet the majority of affected individuals experience no significant symptoms. Clinically meaningful NSD that warrants medical or surgical intervention is far less prevalent. The deviation may be congenital, arising from pressure on the developing nose during vaginal delivery, or acquired through trauma: nasal fractures from sports injuries, motor vehicle accidents, or facial trauma are the most frequent causes. Growth spurts during adolescence can accentuate a pre-existing displacement. When symptomatic, deviated septum can profoundly affect breathing, sleep quality, and quality of life — yet it remains highly treatable, with surgical correction achieving durable relief in the great majority of patients.
Table of Contents
- Anatomy of the Nasal Septum
- Types of Septal Deviation
- Symptoms
- Diagnosis
- Medical Management
- Surgical Treatment: Septoplasty
- Combined Procedures: Septorhinoplasty and Turbinate Reduction
- Outcomes and Special Populations
- References & Research
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1. Anatomy of the Nasal Septum
The nasal septum is a midline partition that divides the nasal cavity into right and left air passages. It is a composite structure built from three distinct skeletal components. The quadrilateral cartilage occupies the anteroinferior portion and is the part most visible and palpable at the tip of the nose; it is the most common site of deviation and the primary target of surgical correction. Posterosuperiorly, the perpendicular plate of the ethmoid bone descends from the cribriform plate to meet the cartilage at the osseocartilaginous junction. Posteroinferiorly, the vomer — a thin, plow-shaped bone — extends from the sphenoid body to the floor of the nasal cavity. Additional contributions from the septal process of the maxilla and the horizontal plate of the palatine bone form the floor of the septum.
Both surfaces of the septum are lined with mucoperiosteum and mucoperichondrium — layers of mucous membrane fused to the underlying periosteum or perichondrium. The mucosal covering is composed of pseudostratified ciliated columnar epithelium, which is responsible for the mucociliary clearance that traps and sweeps inhaled particles toward the nasopharynx. In the superior nasal vault, near the cribriform plate region, specialized olfactory epithelium contains bipolar sensory neurons that project to the olfactory bulb via the cribriform plate foramina.
Blood supply to the anterior septum converges in a region known as Kiesselbach's plexus (Little's area), where branches of the anterior and posterior ethmoidal arteries, the sphenopalatine artery, the greater palatine artery, and the superior labial artery anastomose. This rich anastomotic network is the most common site of epistaxis in both children and adults — and is clinically significant in deviated septum because a spur or angulated cartilaginous edge at this location can cause repeated mucosal trauma and bleeding.
The nasal septum serves critical physiological functions beyond structural support. It creates the two separate nasal passages through which inhaled air must travel, generating laminar airflow patterns that facilitate efficient warming, humidification, and filtration. When the septum is displaced, the aerodynamic properties of at least one passage are disturbed, and the resulting turbulent or reduced airflow impairs these conditioning functions. Importantly, the inferior, middle, and superior turbinates projecting from the lateral nasal wall undergo compensatory hypertrophy on the side with more space — the paradoxical response of mucosal tissue to chronically reduced resistance — compounding the obstruction over time.
2. Types of Septal Deviation
Septal deviations are classified by their shape, anatomical location, and structural character. The C-shaped deviation is the most common morphology: the septum curves as a single convex arc toward one side, creating one narrowed nasal passage and one widened passage. Less frequently, an S-shaped deviation bows toward each side at different vertical levels, producing bilateral narrowing — one on either side — at different points along the nasal cavity. S-shaped deviations are more difficult to correct surgically because the surgeon must address two points of angulation rather than one.
Anterior dislocation of the caudal septum — often called a caudal septal deflection — is among the most functionally significant variants. The caudal end of the quadrilateral cartilage slips out of the vomerine groove and deflects to one side, producing visibly asymmetric nostrils that can be seen externally and confirmed by palpating the columella. Because the caudal septum contributes structural support to the nasal tip, its displacement commonly causes both breathing obstruction and cosmetic deformity. This variant typically demands a more technically demanding repair than correction of more posterior deviations.
A septal spur is a distinct lesion — a sharp ridge or projection of bone or cartilage extending into the nasal cavity, often at the osseocartilaginous junction. Spurs can impinge directly against the inferior turbinate or the lateral nasal wall, causing contact point headache — a unilateral pressure-type headache attributed to mucosal contact pressure — as well as epistaxis and unilateral obstruction. Several classification systems have been developed to standardize the description of septal deviation. The Cottle classification divides the nasal septum into five zones from the nasal tip to the posterior choanae, allowing surgeons to communicate the location of a deviation precisely. The Kirschner classification organizes deviations into types based on their structural character (caudal, dorsal, posterior, etc.).
A septal perforation — a hole through the full thickness of the septum — is a separate, important entity that shares causes with acquired septal deviation. Common causes include prior septal surgery, nasal cocaine use (which causes vasospasm and ischemic necrosis), granulomatous diseases such as granulomatosis with polyangiitis (Wegener's) or sarcoidosis, and repeated intranasal steroid spray directed at the septum. Perforations cause turbulent airflow, crusting, epistaxis, and a whistling noise during breathing; they are managed differently from simple deviation and are notably difficult to repair permanently.
3. Symptoms
Nasal obstruction is the cardinal symptom of deviated septum, reported by the overwhelming majority of symptomatic patients. Obstruction is typically unilateral, corresponding to the side toward which the septum deviates, and worsens with any cause of mucosal swelling — including upper respiratory infections, allergic flares, changes in ambient temperature, or alcohol ingestion, all of which cause turbinate engorgement that narrows an already-restricted passage. Patients often notice a predictable variation in which nostril feels more blocked, a phenomenon partially explained by the nasal cycle: a normal, physiologically programmed alternation in which nasal congestion shifts from one side to the other approximately every two to four hours, mediated by autonomic vascular tone. In a symmetric nose, neither cycle phase is noticed consciously; in a deviated nose, the phase that congests the deviated side produces dramatic subjective blockage while the alternate phase feels relatively open.
Mouth breathing is a common adaptive behavior that patients develop when nasal airway resistance becomes too high for comfortable nasal breathing. Chronic mouth breathing has downstream consequences including dry mouth, worsened dental health, altered maxillofacial development in children, and impaired sleep quality. Snoring is generated in part by nasopharyngeal turbulence when airflow is forced through a constricted nasal passage at increased velocity; NSD is a recognized contributor to snoring and, when severe, to obstructive sleep apnea (OSA). The Starling resistor model explains why nasal obstruction worsens OSA: increased nasal resistance generates greater negative intraluminal pressure in the pharynx during inspiration, promoting collapse of the soft palate and tongue base against the posterior pharyngeal wall.
Recurrent or chronic sinusitis is a well-documented association with NSD, particularly when the deviation narrows or directly obstructs the sinus drainage pathways. The maxillary and anterior ethmoid sinuses drain through the ostiomeatal complex in the middle meatus; septal deviation that compresses this region impairs mucociliary drainage, creating a favorable environment for bacterial colonization. Patients may experience recurrent episodes of facial pressure, purulent nasal discharge, and post-nasal drip attributable to impaired sinus aeration.
Epistaxis is particularly associated with septal spurs, where the sharp bony projection creates a focal area of mucosal dryness, ulceration, and vessel disruption at or near Kiesselbach's plexus. Anosmia or hyposmia (reduced sense of smell) can occur when a high septal deviation narrows the olfactory cleft, preventing odorant molecules from reaching olfactory epithelium in adequate concentration. Contact point headache — typically a unilateral, pressure-type facial pain or headache — can occur when the deviated septum contacts the turbinate or lateral wall. This diagnosis remains controversial and should be established only after CT correlation confirms the contact point, and after other headache etiologies have been excluded.
4. Diagnosis
Diagnosis begins with a careful history characterizing the duration and severity of nasal obstruction, its laterality, its relationship to the nasal cycle, and its association with bleeding, headache, smell disturbance, or snoring. Anterior rhinoscopy using a nasal speculum and headlight — or simply a handheld otoscope — provides the initial view of the anterior septum and inferior turbinates. While anterior rhinoscopy can identify obvious caudal cartilaginous deviations, it misses posterior deviations and does not evaluate the sinus drainage pathways.
Nasal endoscopy — using a rigid 0° or 30° Hopkins rod endoscope, or a flexible fiberoptic endoscope — is the gold standard for complete functional assessment. It permits visualization of the entire nasal cavity from vestibule to nasopharynx, including the middle meatus (site of maxillary and ethmoid sinus ostia), the posterior septum, and the posterior choanae. Endoscopy can identify posterior deviations invisible on anterior rhinoscopy, assess turbinate hypertrophy in detail, and evaluate the ostiomeatal complex for edema, polyps, or mucopurulent discharge consistent with sinusitis.
Objective airflow assessment tools, while primarily used in research and surgical outcome studies, include rhinomanometry (measures nasal airway resistance by simultaneous flow and pressure recording), acoustic rhinometry (uses reflected sound waves to map the cross-sectional area of the nasal passage at each depth), and the Peak Nasal Inspiratory Flow (PNIF) meter (simple handheld device measuring maximum inspiratory flow rate through the nose). These tools quantify the degree of nasal obstruction and provide objective pre- and post-operative documentation.
CT of the paranasal sinuses with coronal reconstructions is the imaging study of choice when surgery is being planned or when sinusitis is suspected. CT precisely maps the three-dimensional anatomy of the septum relative to the turbinates, the ostiomeatal complexes, and the sinus cavities; it identifies associated pathology such as mucosal thickening, polyps, or complete opacification of sinuses; and it is required prior to functional endoscopic sinus surgery (FESS) as a surgical roadmap. Sinus disease burden is quantified using the Lund-Mackay scoring system. Patient-reported symptom burden is measured using the validated SNOT-22 questionnaire (Sinonasal Outcome Test, 22 items), which captures nasal, ear, sleep, and emotional domains and serves as the primary patient-reported outcome measure in surgical research.
5. Medical Management
Intranasal corticosteroid sprays are the first-line pharmacological intervention for symptomatic NSD, particularly when concurrent mucosal inflammation, allergic rhinitis, or turbinate hypertrophy contributes to obstruction. Agents such as fluticasone propionate, mometasone furoate, and budesonide reduce mucosal edema and turbinate engorgement, thereby increasing the functional cross-sectional area of the nasal airway. However, corticosteroid sprays do not alter the underlying cartilaginous or bony deviation itself; their benefit is therefore greatest in patients whose obstruction has a significant inflammatory component. Correct spray technique is critical: the nozzle should be directed toward the lateral wall (away from the septum) to reduce the risk of mucosal atrophy and septal perforation with chronic use.
Decongestants provide rapid but temporary relief. Topical oxymetazoline (0.05%) acts within minutes and dramatically reduces turbinate size, but its use must be limited to three to five days to avoid rhinitis medicamentosa (rebound congestion from receptor downregulation). Oral pseudoephedrine and phenylephrine offer less potent but longer-duration decongestant effects without the rebound risk, though they carry systemic cardiovascular considerations — increased heart rate and blood pressure — that limit use in hypertensive patients. Isotonic or hypertonic saline nasal irrigation (using neti pots, squeeze bottles, or pulsatile irrigators) improves mucociliary clearance, reduces crusting, soothes dry or irritated mucosa, and can be used indefinitely without systemic effects.
When allergic rhinitis is identified as a contributing factor — through clinical history, skin prick testing, or allergen-specific IgE measurement — allergen avoidance, antihistamines, and allergen immunotherapy (subcutaneous or sublingual) address the inflammatory driver of turbinate hypertrophy alongside the structural deviation. For patients with coexisting obstructive sleep apnea, continuous positive airway pressure (CPAP) or auto-titrating APAP devices address the respiratory consequences of nasal obstruction independently of anatomical anatomy. CPAP use may itself be limited by nasal obstruction — patients with significant NSD may require higher pressures or experience more discomfort — and surgical correction of the septum can improve CPAP adherence.
Medical management is appropriate for patients with mild symptoms, those who prefer to avoid surgery, those with contraindications to general anesthesia, and as a trial to determine how much of the obstruction is mucosal versus structural. When medical therapy provides adequate symptomatic control, no further intervention is required. When symptoms remain significantly impaired despite optimal medical management, surgical referral is appropriate.
6. Surgical Treatment: Septoplasty
Septoplasty is the definitive surgical procedure for correction of symptomatic nasal septal deviation. It is one of the most commonly performed operations in otolaryngology, typically carried out under general anesthesia (local anesthesia with sedation in selected patients) in an ambulatory or same-day surgery setting. The procedure involves gaining access to the septal skeleton through a carefully placed incision, mobilizing the mucoperichondrial and mucoperiosteal flaps to expose the underlying cartilage and bone, and then correcting the deviated structural elements while preserving the architectural support the septum provides to the nasal dorsum and tip.
The standard approach uses a hemitransfixion incision (or a Killian incision placed a few millimeters posterior to the columella-septum junction), through which the surgeon elevates bilateral mucoperichondrial flaps in the avascular subperichondrial plane. This plane preserves mucosal blood supply and minimizes risk of perforation. Deviated cartilage may be scored, repositioned, partially resected, or replaced, but a critical principle governs every septoplasty: the L-strut — a minimum of 10 to 15 mm of dorsal cartilage and 10 to 15 mm of caudal cartilage — must be preserved as a structural backbone to prevent saddle nose deformity or tip ptosis. Deviated bony portions (perpendicular plate of ethmoid, vomer) are removed with through-cutting forceps, microdebrider, or osteotomes.
When the internal nasal valve angle — the angle between the upper lateral cartilage and the dorsal septum, normally 10–15°— is narrowed and contributes to obstruction, spreader grafts (strips of harvested septal or rib cartilage interposed between the upper lateral cartilages and the dorsal septum) can widen the valve angle and dramatically improve inspiratory airflow. Correction of caudal septal dislocations requires more complex maneuvers including swinging-door techniques, caudal extension grafts, or complete caudal septal replacement with a cartilage graft fixed to the anterior nasal spine.
Surgical outcomes are generally favorable: approximately 70–80% of patients achieve significant symptom improvement, 15–20% experience partial improvement, and 5–10% report no meaningful benefit. Risks of septoplasty include perioperative bleeding, infection, and — most importantly — septal hematoma, a surgical emergency in which blood collects between the mucoperichondrial flaps and the cartilage, cutting off the cartilage's blood supply. Untreated septal hematoma progresses to cartilage necrosis, secondary infection, and saddle nose deformity; it requires urgent drainage. Other risks include septal perforation (1–2%), altered nasal tip projection or rotation (because the caudal septum contributes columellar support), cerebrospinal fluid leak (rare, if the cribriform plate is violated superiorly), and revision surgery in 5–20% of cases. Post-operatively, bilateral nasal packing or internal splints are maintained for one to five days; patients avoid nose-blowing for one week, and full recovery typically requires three to six weeks.
7. Combined Procedures: Septorhinoplasty and Turbinate Reduction
Septorhinoplasty combines functional septoplasty with cosmetic rhinoplasty in a single surgical session. This combined approach is indicated when the patient has both a symptomatic nasal obstruction and a concurrent external nasal deformity — a crooked nose, dorsal hump, tip irregularity, or post-traumatic asymmetry — that they wish to address. The simultaneous approach offers a single recovery period and a single anesthetic exposure, and it allows cartilage harvested from the septum during septoplasty to be repurposed immediately as grafting material for dorsal augmentation, tip refinement, or alar support. The functional component is covered by insurance when medically indicated; the cosmetic component typically is not and requires patient-pay arrangements.
Inferior turbinate reduction is frequently performed concurrently with septoplasty because inferior turbinate hypertrophy coexists with NSD in the majority of symptomatic patients. On the side opposite the deviation, the turbinate has undergone compensatory hypertrophy to fill the widened space; correcting the deviation without addressing the hypertrophic turbinate may leave that side still partially obstructed even after the septum is straightened. Multiple techniques are available: radiofrequency ablation (Coblation) delivers controlled thermal energy to the submucous tissue, causing fibrosis and reduction while largely preserving the mucosal surface; submucous diathermy uses bipolar cautery submucosally; microdebrider-assisted turbinoplasty mechanically removes submucous tissue with targeted precision; and partial inferior turbinectomy removes the anterior portion of the turbinate. Complete turbinectomy is avoided because it can lead to atrophic rhinitis — a permanently dry, crusting, foul-smelling nasal cavity that is more disabling than the original obstruction.
When chronic sinusitis coexists with NSD, functional endoscopic sinus surgery (FESS) may be added. Septoplasty alone does not treat established sinusitis but can improve access for sinus instrumentation and post-operative sinus irrigation. FESS opens and enlarges the natural drainage pathways of the maxillary, ethmoid, frontal, and sphenoid sinuses, restoring mucociliary clearance under direct endoscopic visualization. The combination of septoplasty, turbinate reduction, and FESS addresses all three overlapping pathological processes — structural deviation, mucosal hypertrophy, and sinus disease — in a single procedure and yields consistently superior outcomes compared to any component performed in isolation.
8. Outcomes and Special Populations
The primary measure of surgical success in septoplasty research is improvement on the SNOT-22 questionnaire. A change of 12 or more points from baseline is defined as the minimum clinically important difference (MCID) — the threshold at which patients report subjectively meaningful improvement. Studies consistently demonstrate SNOT-22 improvements exceeding this threshold in the majority of septoplasty patients at six and twelve months. Nasal obstruction is the symptom most reliably and durably improved by surgery; sleep quality, snoring, and daytime fatigue also improve significantly in most patients. Sleep-disordered breathing and OSA partially improve after septoplasty — patients may require lower CPAP pressures and demonstrate better CPAP adherence — but septoplasty alone is generally insufficient to resolve clinically significant OSA, which requires dedicated sleep medicine management including weight loss, positional therapy, mandibular advancement devices, or upper airway surgery targeting the pharynx.
The question of pediatric septoplasty requires nuanced judgment. Traditional teaching advises deferring septoplasty until nasal growth is complete — approximately age 15–16 in females and 17–18 in males — because disrupting the septal cartilage in a growing child might theoretically impair nasal and midface development. In practice, most surgeons adhere to this principle but recognize important exceptions: severe bilateral nasal obstruction causing feeding difficulties in infants, sleep-disordered breathing with significant consequences for growth and neurodevelopment, and congenital structural anomalies such as bilateral choanal atresia that require early intervention. When septoplasty is performed in children and adolescents, the most conservative approach is used — minimal cartilage removal, maximal repositioning — to preserve growth potential.
Athletes and individuals in contact sports constitute a population with both elevated prevalence of acquired NSD and heightened functional demands on nasal airflow. Nasal fractures represent the leading cause of traumatic septal deviation in this group; boxing, wrestling, martial arts, rugby, and ice hockey carry the highest risk. Protective equipment — nasal guards, full-face shields, and helmets — reduces but does not eliminate nasal injury risk. Athletes seeking septoplasty should plan surgery during the off-season and allow full structural healing (typically three to six months) before resuming contact sports to minimize the risk of re-injury to an incompletely healed septum.
The psychological and quality-of-life impact of symptomatic NSD is frequently underestimated by clinicians. Sleep fragmentation from chronic nasal obstruction, with its downstream effects on daytime concentration, emotional regulation, athletic performance, and work productivity, represents a substantial hidden burden. Patients who present requesting surgical intervention are often doing so after years of failed medical management and significantly impaired daily function. Validated quality-of-life tools such as the SNOT-22 and the Nasal Obstruction Symptom Evaluation (NOSE) scale provide objective frameworks for capturing this burden, establishing surgical candidacy, and documenting post-operative benefit — and they reinforce that symptomatic NSD is a genuine disease warranting treatment, not merely a cosmetic inconvenience.
References & Research
Search PubMed: Septoplasty outcomes · Septal deviation and sleep
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