Nasal congestion occurs when the nasal passages are blocked, usually due to swelling of the membranes in the nose.
Treatment for nasal congestion includes taking medication. Common drug classes used to treat nasal congestion are alpha agonists, antihistamine / alpha agonist combinations, antihistamine / sudafed combinations, expectorant / opioid / sudafed combinations, expectorant / sudafed combinations, and antihistamine / opioid / sudafed combinations.