Eustachian tube blockage may be caused by respiratory tract infection, adenoid hypertrophy, nasopharyngeal tumors, etc., which may lead to blocked feeling, tinnitus and other manifestations. 1. Respiratory tract infection: mostly seen in acute upper respiratory tract infection, mainly due to viral infection, and may be combined with bacterial infection in the later stage, when the infection is more serious, it may lead to Eustachian tube mucous membrane swelling and Eustachian tube blockage. 2. Adenoid hypertrophy: adenoid hypertrophy is mostly seen in children, when adenoid hyperplasia and hypertrophy occurs, it will cause mechanical compression on the eustachian tube, which will lead to the blockage of the eustachian tube. 3. Nasopharyngeal tumors: benign and malignant tumors can compress the pharyngeal portion of the Eustachian tube and cause blockage. Eustachian tube blockage may also be caused by other reasons, it is recommended to go to the hospital in time, after clarifying the cause, cooperate with the doctor to take treatment.