POSSIBLE CAUSES OF A BLOCKED NOSE
There are many reasons why your nose might constantly feel like it is blocked or you can’t get enough air through it:
INFLAMED NASAL LINING
The tissue layer inside your nose may get irritated by allergies and can swell. These swollen areas narrow the air passages, restricting air flow through your nose.
The cartilage that divides your nasal cavity in half is the septum. Some septums may be
misaligned, or deviated, and cause breathing difficulty if the imbalance is significant.
Turbinates, or ridges, of tissue inside your nose that conduct air may swell and cause nasal congestion and blockage.
NARROW OR COLLAPSING NASAL VALVE
The nasal valves inside your nasal passage are narrow “flaps” that regulate airflow. If the valve is too narrow or weak, the airflow may be disrupted and cause blockage.
Polyps occur in tissue throughout your body. Nasal polyps are typically not an issue, but if polyps grow too large, they block the nasal passages and can cause blockage.