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Is a Deviated Septum Dangerous? Answers from an ENT in Gangnam, Seoul

Answered by Dr. Kim Yoo Suk, MD · Board-certified otolaryngologist · Former professor, Yonsei & Ajou University · Consultations in English

Short answer: usually harmless, sometimes worth fixing

The nasal septum is the wall of cartilage and thin bone that divides the nose into left and right passages. A deviated septum is a septum that is bent or shifted to one side. Studies of healthy adults show that most people have some degree of deviation, and many never notice it.

A deviation does not damage the brain, does not turn into cancer, and is not an emergency. The question an ENT asks is not "is it crooked?" but "is it causing problems?"

When a deviated septum causes real problems

A significant deviation can narrow one or both airways. Depending on where the bend sits, it may lead to:

• Constant blockage of one nostril, or alternating blockage when combined with turbinate swelling
• Mouth breathing, dry mouth, and a sore throat in the morning
• Snoring and, in some people, a contribution to obstructive sleep apnea
• Poor sinus drainage and repeated sinus infections
• Nosebleeds from dry air hitting the prominent part of the bend
• Difficulty using CPAP or tolerating nasal sprays

These problems affect sleep, exercise, and daily comfort. They are a quality-of-life issue rather than a danger, but they are a valid reason to seek treatment.

What causes a septum to deviate?

Some people are born with a curved septum, and it may become more noticeable as the face grows. Others develop deviation after a nose injury, including childhood falls they cannot remember. A past nasal bone fracture is a common cause in adults.

What we do at Gangnam Yonsei ENT

Because congestion has several causes, our first step is to find out how much of your blockage actually comes from the septum. Dr. Kim Yoo Suk, a former Yonsei clinical assistant professor whose academic work focused on septoplasty and sinus surgery, examines the nose with a nasal endoscopy. If needed, a CT scan shows the deviation alongside the sinuses and turbinates.

Often the septum is only part of the story. Swollen turbinates from allergic or hypertrophic rhinitis can be the bigger factor, and these respond to medication first. If the septum is the main obstruction and symptoms persist, septoplasty is a functional operation that straightens the cartilage and bone through the nostrils, with no external incision. At our clinic it is performed under local anesthesia and typically takes 20 to 30 minutes. It is sometimes combined with turbinate reduction when both contribute.

When to see an ENT

Book an evaluation if one side of your nose is blocked most of the time, if decongestant sprays are becoming a daily habit, if your partner reports loud snoring or breathing pauses, or if you have repeated sinus infections. Seek prompt care for a nose that looks newly crooked after an injury, or for a swollen, painful septum after trauma, which can indicate a septal hematoma.

Dr. Kim consults in English. Learn more on our English-speaking ENT page or read why one nostril is always blocked.

Related questions

Can a deviated septum get worse with age?

The bend itself usually stays similar in adults, but symptoms can worsen as the nasal tip support weakens with age, or when allergies, weight gain, or turbinate swelling narrow the airway further. A new injury can also increase the deviation.

Can a deviated septum fix itself?

No. Cartilage and bone do not straighten on their own. Medications can shrink swollen lining around the septum and improve airflow, but if the structural bend is the main problem, only septoplasty changes its shape.

Does a deviated septum change the shape of my nose?

Not always. Many deviations are internal and invisible. When the front part of the septum or the nasal bones are also bent, the outside of the nose may look crooked, which is assessed separately from breathing function.

This answer is general medical information written and reviewed by an ENT specialist. It is not a diagnosis. Please see a doctor for an examination. In an emergency in Korea, call 119.