Allergic rhinitis for several months with nose blockage, sneezing, irritation, and mucus is usually triggered by dust, smoke, weather changes, strong smells, pollution, or animal allergens. Antibiotics often do not help because allergy-related inflammation is not caused by bacteria. Overusing nasal sprays, especially decongestant sprays, can sometimes worsen blockage and create rebound congestion after frequent use. Try to reduce exposure to dust and smoke, wash bedsheets regularly, keep rooms ventilated, and use a mask while cleaning. Steam inhalation and saline nasal rinses may help clear mucus naturally. Allergy medicines such as antihistamines or steroid nasal sprays are commonly used for long-term control, but they should be used correctly and under medical guidance. Inform your doctor about the spray you are using and how often you use it, as the treatment may need adjustment. Seek medical care if you develop facial pain, fever, breathing difficulty, or disturbed sleep due to severe blockage.

Repeated nasal congestion in one nostril can be caused by allergic rhinitis, a deviated nasal septum, sinus inflammation, dust exposure, pollution, nasal polyps, or nasal swelling. Some people notice a blockage more on one side because the nasal passages naturally swell and shrink throughout the day. Symptoms may worsen with weather changes, smoke, strong odours, or prolonged lying on one side. Steam inhalation, saline nasal rinses, staying hydrated, and avoiding dust or smoke may help reduce irritation and mucus buildup. Allergy medicines or steroid nasal sprays are commonly used when allergies or inflammation are responsible, but they should be used correctly and not excessively. Sleeping with the head slightly elevated may also improve breathing at night. Consult your doctor if the blockage continues for many weeks, becomes painful, causes facial pressure, frequent headaches, nosebleeds, or difficulty breathing, as further examination may be needed to identify the exact cause.