Congestion from cold and flu is the buildup of mucus in your nose, sinuses, or chest that causes a feeling of fullness or blockage. When you're dealing with congestion from a cold or the flu, you want ...

Congestion can interfere with breathing, cause headaches, and keep you awake at night. Sinus drainage issues may result from a cold, the flu, COVID-19, allergies, pollution, or even just dry air.