One nose blocked: what to know

The lining inside the nose naturally becomes fuller on one side and then the other, so mild alternating blockage can be normal. A [Common Cold](/conditions/common-cold/), [Allergic Rhinitis](/conditions/allergic-rhinitis/) or [House Dust Mite Allergy](/conditions/house-dust-mite-allergy/) can swell the lining and increase mucus. A deviated nasal septum, nasal polyp, irritant exposure or local infection can keep one side blocked. Facial pressure, thick mucus, reduced smell or fever may point towards [Sinusitis](/conditions/sinusitis/).

Night-time blockage and loud snoring can occur with nasal congestion, but persistent snoring, pauses in breathing or marked daytime sleepiness should be discussed because [Obstructive Sleep Apnoea](/conditions/obstructive-sleep-apnoea/) may need assessment.

Use a saline nasal spray or rinse prepared with safe water, drink fluids, and avoid smoke, strong fragrances and other triggers. If allergy symptoms are present, ask a pharmacist or clinician whether [Allergy Medication](/treatments/medical-management/allergy-medication/) is suitable. Follow the product instructions for any decongestant, since some are unsuitable with certain medical conditions and prolonged use of nasal decongestant sprays can worsen congestion. Do not put objects into the nostril.

Arrange a medical review if one-sided blockage persists, repeatedly returns on the same side, causes recurrent nosebleeds, or is accompanied by facial swelling, severe pain, a reduced sense of smell or discharge with an unpleasant odour. Seek urgent help for trouble breathing, swelling around the eye, vision changes, severe headache, confusion or a high fever with rapid deterioration.

Ask whether the pattern fits allergy, infection, a septum problem or a polyp; whether your medicines could contribute; and whether you need an examination inside the nose. Ask which rinse or spray is appropriate and how long to try it before follow-up.