The nasal septum is the thin wall that runs down the center of your nose, dividing it into two separate passages. It’s made of both cartilage and bone, and it plays a key role in how you breathe, how air moves through your nasal passages, and even how your nose holds its shape. About 80% of people have a septum that’s at least slightly off-center, which means problems with this structure are remarkably common.
What the Septum Is Made Of
The nasal septum isn’t one solid piece. It’s a patchwork of different materials that fit together like puzzle pieces, with softer cartilage toward the front and harder bone toward the back.
The front portion is formed by a piece of flexible cartilage called the quadrangular cartilage. This is the part you can feel if you press the tip of your nose side to side. Because it’s cartilage rather than bone, it gives the nose some flexibility and resilience.
Behind the cartilage, the septum transitions into bone. Two bones make up most of this bony section: the perpendicular plate of the ethmoid bone (a thin, flat piece that drops down from the skull) and the vomer, which sits lower and connects to the roof of the mouth. The very bottom of the septum rests on a bony ridge called the maxillary crest, formed by parts of the upper jawbone and the palatine bone deeper in the skull.
All of these components are covered by a thin membrane called the mucosa, which keeps the tissue moist and helps warm and humidify the air you breathe.
What the Septum Does
The septum’s most basic job is structural: it divides the nasal cavity into right and left passages, which helps direct and regulate airflow. Without it, the nose would essentially be one wide-open chamber, making it harder for your body to efficiently warm, moisten, and filter incoming air before it reaches the lungs. The septum also provides structural support for the external shape of the nose, particularly along the bridge and tip.
The front of the septum is also one of the most common sites for nosebleeds. A dense network of small blood vessels called Kiesselbach’s plexus sits just inside the nostrils on the septum’s surface. Because these vessels are close to the surface and exposed to dry air, even minor irritation, nose picking, or dry winter air can trigger bleeding from this spot.
How the Septum Grows Over Time
The septum doesn’t finish developing until well into adulthood. The cartilage portion grows rapidly during the first two years of life, then slows considerably and nearly stops growing after age three. The bony perpendicular plate, however, keeps growing at a brisk pace until around age 10, then continues more slowly until roughly age 40. This prolonged growth window is one reason why septal deviations can develop or worsen over time, even without an obvious injury.
Deviated Septum: When It’s Off-Center
A perfectly straight septum is actually unusual. Most people have some degree of asymmetry, and for many it never causes any noticeable problems. But when the deviation is significant enough to narrow one or both nasal passages, it can lead to a range of symptoms.
The most common complaint is difficulty breathing through one side of the nose. You might notice chronic congestion that doesn’t respond to allergy or cold medications, or that one nostril always feels more blocked than the other. Breathing problems often become more noticeable during exercise, when your body demands more airflow. Other symptoms include frequent nosebleeds, facial pain or headaches, recurrent sinus infections, and loud breathing.
Snoring is one of the hallmark signs. When the nasal passages are uneven in size, it’s harder to get a full breath through the nose, which pushes more air through the mouth and throat during sleep. Chronic nasal obstruction from a deviated septum can also contribute to poor sleep quality, frequent nighttime awakenings, and in some cases may overlap with or worsen sleep apnea.
How a Deviated Septum Is Diagnosed
Doctors can often spot a significant deviation just by looking inside your nostrils with a handheld light and a nasal speculum. For a more detailed view, they may perform a nasal endoscopy: a thin, flexible tube with a tiny camera and light is inserted into the nostril. Before the scope goes in, a decongestant spray reduces swelling and a numbing spray keeps you comfortable. The camera projects images onto a screen, giving the doctor a clear look at the septum, the turbinates (the ridges along the side walls), and the sinus openings. This helps them distinguish a deviated septum from other causes of obstruction like nasal polyps or swollen turbinates.
When Surgery Is Recommended
No medication can straighten a crooked septum. Decongestants, steroid sprays, and saline rinses can ease congestion temporarily, but if symptoms persist despite these treatments, surgery becomes the primary option. The American Academy of Otolaryngology lists several situations where septoplasty, the surgical correction of a deviated septum, is appropriate: nasal obstruction causing mouth breathing, snoring, congestion, or sleep apnea that hasn’t improved with medical management; frequent nosebleeds linked to the deviation; or facial pain originating from a point where the bent septum presses against the side wall of the nose.
Sometimes the septum itself isn’t causing symptoms, but its shape blocks access to the sinuses. In those cases, straightening it may be necessary before a surgeon can treat a separate sinus condition.
What Septoplasty Involves
Septoplasty is typically performed under general anesthesia, though local anesthesia is sometimes an option. The surgeon makes an incision inside the nose on one side, lifts the mucosa away from the cartilage and bone, then reshapes or removes the portions causing the obstruction. The mucosa is laid back into place, and soft splints or packing are placed inside the nose to hold the tissue steady, prevent bleeding, and reduce the risk of scar tissue. In some cases, dissolving stitches are used instead of packing.
Initial recovery takes about one to two weeks. Most people can return to light activities like walking and basic chores within a week. Strenuous exercise usually needs to wait about a month. Full healing of the bone and cartilage continues for several months after the procedure.
Septal Perforation: A Hole in the Septum
A separate condition from a deviation, a septal perforation is an actual hole through the septum. The telltale sign is a whistling sound when breathing through the nose. Other symptoms include dryness and crusting inside the nose, nosebleeds, a runny nose, nasal obstruction, and in more severe cases a visible dip in the bridge of the nose known as a saddle nose deformity.
Perforations happen when the blood supply to the septal tissue gets disrupted, causing the tissue to break down. Common causes include nose injuries (including a broken nose or even aggressive nose picking), overuse of steroid nasal sprays, cocaine use, exposure to industrial chemicals like chromium, and certain infections such as tuberculosis. Autoimmune diseases that damage blood vessels can also lead to perforation. Occasionally, a perforation occurs as a complication of septoplasty itself or cauterization procedures used to stop nosebleeds.