Most evenings when I have dinner the act of swallowing my meal causes me to feel the need to cough up thick mucus from the back of my throat. It is not GERD in my case but I’m sure the swallowing action frees up congestion which I have to cough up. It is usually dense mucous the size of a pea from my airway or sinus. It may also be due to drinking a glass of wine with my meal.