When you cough, the sudden pressure in your airways can force excess mucus from your throat or sinuses out through your nose. This is a very common, normal reaction to respiratory irritation, allergies, or a mild cold. To help manage this, you can use a generic expectorant like guaifenesin to thin the mucus, making it easier to clear. A saline nasal spray can also help flush out your nasal passages safely. If allergies are suspected, a non-drowsy antihistamine like cetirizine may assist. Keep well-hydrated to thin the secretions. If your symptoms persist for more than a week or worsen, please consult a doctor for a personalized evaluation.