The ear and the mouth are connected, exactly the ear and the nasopharynx are connected, through the eustachian tube. The eustachian tube opens at one end in the nasopharynx and at the other end in the tympanic cavity, which serves to balance the pressure inside and outside the tympanic cavity and drain the fluid in the cavity, etc. When there is an upper respiratory tract infection, rhinitis, etc., it can cause congestion and swelling of the eustachian tube, resulting in a failure to balance the pressure inside and outside the tympanic chamber, causing ear congestion and hearing loss. Therefore, the treatment requires 1% furosemide nasal drops to reduce the congestion and swelling of the eustachian tube to achieve the purpose of treatment, while still actively treating upper respiratory tract infections to reduce the congestion and swelling of the nasopharynx to facilitate the recovery of the disease.