Tinnitus when riding a high speed train through a tunnel may be caused by the fact that the pressure inside the ear is still the same as before the tunnel when the outside pressure suddenly becomes bigger after entering the tunnel, and the human eustachian tube cannot be adjusted in time, resulting in different pressure inside and outside the tympanic chamber, which is manifested as negative pressure in the tympanic chamber, thus inducing tinnitus. In this case, patients are advised to do the following: the first one is to suggest patients to do swallowing action, or open their mouths to yawn or chew gum to promote the opening of the eustachian tube, so as to promote the consistency of the pressure inside and outside the tympanic chamber. The second is that if the patient has persistent tinnitus, accompanied by ear pain and hearing loss, the possibility of secretory otitis media cannot be ruled out. In this case, the patient needs to go to the ENT department to improve the acoustic conductance examination, and can use some antibiotics, oral mucus promoter, nasal spray hormone spray nose, promote the opening of the pharyngeal opening of the eustachian tube and other related treatments to relieve tinnitus.