Many people have an uneven septum, which makes one nostril larger than the other. Severe unevenness is known as a deviated septum. It can cause health complications such as a blocked nostril or difficulty breathing. An uneven septum is very common.

Why can I only breathe through one nostril?

If one nostril is harder to breathe through than the other, you probably have a deviated septum. Deviated septums have the potential to cause a variety of problems, including a blocked nasal passage, snoring and/or trouble sleeping, mouth breathing, nosebleeds, or recurring sinus infections.

What is it when one nostril is blocked?

Chronic and persistent obstruction on one side should be evaluated by a doctor, and probably an ENT (otolaryngologist). Foreign objects in the nose. In small children, blockage in one nostril might be due to a foreign body that they put in their nose.