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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:
Nasal Mucus. Colds, allergies and sinus infections can lead to a stuffy nose and sinuses clogged with thick mucus. Tea with lemon, hot lemonade or honey and lemon are common home remedies that can help ease congestion. But their positive effect might derive from the liquids more than from the inclusion of lemon.