Clogged ears are one of the most common complaints during cold and flu season, especially when seasonal allergies and sudden weather changes often make congestion worse. That stuffy, underwater feeling can be uncomfortable, and it could be a normal symptom of colds, flu, and sinus infections. Swelling in your nasal passages can block the eustachian tube, the small passage connecting your middle ear to your throat, causing pressure and muffled hearing. Most cases clear up ...