Why Is One Nostril Always Blocked? Causes & Solutions
Have you ever noticed that one side of your nose seems more congested than the other? You’re not imagining it—and in most cases, it’s completely normal. But if one nostril is persistently blocked, there might be more going on.
The Nasal Cycle: Your Body’s Natural Rhythm
Your nostrils take turns being the dominant breathing passage. This phenomenon, called the nasal cycle, means that at any given time, one nostril is handling most of the airflow while the other is partially congested.
How the Nasal Cycle Works
Every 2-6 hours, your body alternates which nostril is more open. Blood flow increases to the nasal tissue on one side, tissue swells reducing airflow, and after several hours, the cycle reverses.
When One-Sided Blockage Isn’t the Nasal Cycle
Deviated Septum
The septum isn’t perfectly centered in most people. Signs include: blockage always on the same side, symptoms present for years, and possible history of nose injury. A deviated septum is also one of the most common structural causes of chronic snoring — see our deviated septum and snoring guide for a detailed look at how it affects your airway at night and what treatments help.
Nasal Polyps
Benign growths that can cause one-sided obstruction, often with loss of smell and facial pressure.
Chronic Rhinitis
Inflammation affecting one side more, whether from allergies, irritants, or other triggers. This persistent inflammation can sometimes contribute to sinus pressure and headaches.
Lifestyle Factors
Sleep Position
The side you sleep on affects congestion—the lower nostril often becomes more congested due to gravity.
Environmental Allergies
Allergens in bedding may affect the nostril closest to your pillow more than the other.
How to Get Relief
- Saline irrigation: Rinse both nostrils with a trusted neti pot and saline solution to flush irritants and thin mucus
- Nasal corticosteroid sprays: Reduce inflammation
- Nasal strips or dilators: May help if structural narrowing is involved
- Antihistamines: If allergies contribute to symptoms
- Warm beverages: Sipping herbal tea for congestion can help loosen mucus and open nasal passages naturally
When to See a Doctor
Schedule an appointment if you experience persistent one-sided blockage lasting more than 3 weeks, one-sided nosebleeds, loss of smell, or symptoms that keep getting worse.
The Bottom Line
A blocked nostril that alternates sides throughout the day is usually normal. If one side is persistently blocked, it could indicate a deviated septum, nasal polyps, chronic rhinitis, or other conditions. Most causes are treatable.
Disclaimer: This article is for informational purposes only. Consult a healthcare provider for diagnosis and treatment.
