Your sinuses and ears are connected inside your head. So sinus congestion and stuffiness can affect the pressure in your ears. Treating the congestion may . Jul 04, · Congestion in ear causes pressure or fullness in the ear together with muffled hearing. Be it Eustachian tube dysfunction or others, remedies can help. Ear congestion usually refers to a vague feeling of ear pressure or fullness together with some degree of muffled hearing in the absence of any ear pain.