Deviated septum: symptoms, how to tell, and how it's treated

A deviated septum is when the thin wall of cartilage and bone that divides the inside of your nose into two passages is bent or off-centre. It is extremely common — most people have at least a slight bend — and for many it causes no trouble at all.

This page is general information to help you understand a deviated septum. It is not a diagnosis. If your breathing is affected, or something doesn't feel right, speak to a GP or an ear, nose and throat (ENT) doctor.

What is a deviated septum?

The nasal septum is the partition that runs down the middle of your nose, separating the left and right nostrils. A deviated septum is simply a septum that leans to one side or is bent, rather than sitting straight down the centre.

It is made of cartilage at the front and bone further back, and it is rarely perfectly straight in anyone. Some people are born with a deviation, and others develop one after a knock or injury to the nose. Because it is so common — surveys suggest a large majority of people have some degree of deviation — having one is usually nothing to worry about.

Is a deviated septum harmful?

In most cases, no. A bent septum on its own will not do you any harm, and if it isn't causing symptoms it can simply be left alone. It only becomes something to act on when the deviation narrows a nasal passage enough to interfere with your breathing, sleep, or quality of life.

What are the symptoms? How do I know if I have one?

The most common sign of a deviated septum is feeling blocked on one side of the nose more than the other. Many people notice that one nostril always seems harder to breathe through.

Symptoms can include:

• A blocked or stuffy nose, often worse on one side — the narrower passage feels congested even when you don't have a cold
• Difficulty breathing through the nose, especially when exercising or lying down
• Nosebleeds, as airflow over a bent septum can dry out and irritate the lining
• Noisy breathing or snoring during sleep, and disturbed, poor-quality sleep
• Repeated sinus infections in some people, if the bend interferes with sinus drainage
• Mouth-breathing at night, particularly if the blockage is significant

Bear in mind that a blocked nose has many causes — colds, allergies, and inflammation among them — so a deviated septum isn't always the explanation. That is why getting properly assessed matters if symptoms persist.

How is a deviated septum diagnosed?

A deviated septum is diagnosed by a doctor examining the inside of your nose. There is no home test that confirms it.

A GP or ENT specialist will look at the outside and inside of your nose, usually with a bright light and a small instrument that gently opens the nostril, to see the position of the septum. They may use a thin camera (an endoscope) to see further back. The aim is to work out whether the deviation actually explains your symptoms, or whether something else — such as allergy or swollen tissues inside the nose — is the real cause.

Can you fix a deviated septum without surgery?

Honestly, no — you cannot straighten the septum itself without surgery. There is no spray, exercise, or device that re-bends cartilage and bone back into place. What non-surgical treatments can do is manage the symptoms so the blockage bothers you less.

Approaches that may ease congestion include:

• Saltwater (saline) nasal sprays or rinses, which can clear and moisten the nasal lining
• Steroid nasal sprays, which reduce swelling of the tissues inside the nose and can make a narrowed passage feel more open
• Treating any underlying allergies, for example with antihistamines if hay fever or dust allergy is adding to the congestion
• Decongestants for short-term relief only — these should not be used for more than about a week, as longer use can make a blocked nose worse

It's worth being clear-eyed about this: a large NHS-led trial found that for people with genuine nasal obstruction caused by a deviated septum, surgery gave better symptom relief than a defined regimen of steroid and saline sprays. Sprays can still be a sensible first step, particularly if allergy is part of the picture, but they manage the symptom rather than correct the deviation.

A safety note. Don't rely on over-the-counter decongestant sprays day after day, and don't try to "manipulate" your own nose. If breathing through your nose is consistently difficult, that's a reason to get assessed rather than to keep self-treating.

What does deviated septum surgery (septoplasty) involve?

Septoplasty is an operation to straighten the septum and improve airflow. It is a common, well-established procedure, usually done under general anaesthetic.

During septoplasty, the surgeon makes a cut inside the nose, then removes or repositions the bent parts of the cartilage and bone so the septum sits closer to the middle. The operation typically takes around 30 to 45 minutes, and because the cut is inside, it doesn't change the way your nose looks from the outside. Your nose will usually feel blocked for a week or two afterwards while it heals, and full settling can take up to a few months.

When is surgery considered? When should I see a doctor?

Surgery is considered when a deviated septum causes ongoing breathing problems or congestion that haven't improved with medication. It is not done for the appearance of the nose, and on the NHS it is offered only when the deviation is genuinely affecting your health — for example persistent nasal obstruction or recurrent sinus problems that don't respond to medical treatment.

See a GP or ENT doctor if you have:

• A nose that is persistently blocked on one or both sides, affecting your sleep, exercise, or daily life
• Frequent nosebleeds or repeated sinus infections
• Noisy, disrupted sleep or daytime tiredness linked to nasal blockage
• A nasal injury that has left your breathing worse than before

It's also worth knowing that nasal and ENT problems can sometimes overlap with other symptoms — for instance, some people also experience ringing or other tinnitus and find it reassuring to have an ENT assessment that looks at the whole picture.

Get urgent help for a nosebleed that won't stop after 10 to 15 minutes of pinching the soft part of the nose, or for any breathing difficulty that comes on suddenly. This page is background information and not a substitute for advice from a healthcare professional.