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The most common causes of chronic nasal congestion are allergic rhinitis, from environmental allergens or irritants, and chronic rhinosinusitis. Chronic rhinosinusitis is defined as a sinus infection of greater than 12 weeks' duration that includes 2 or more major sinus symptoms or at least 1 major and 2 minor symptoms. Major symptoms include:
1 Post-nasal drip (thick mucus). Take an expectorant (this thins mucus and phlegm), drink lots of fluids, breathe through a warm washcloth, and use steam to make the mucus more liquid.  Congestion (blocked nose). This is mostly due to swollen nasal membranes, so shrinking those membranes is the goal.