Tinnitus in the left ear is not necessarily a precursor to serious illness. Tinnitus in the left ear may be physiologic, or it may be caused by otitis media, cervical spondylosis, and other reasons such as noise exposure. Tinnitus in the left ear does not mean that it is a precursor to a serious illness. Generally, normal people in a quiet environment or activities, side-lying position will feel the left ear blood vessel pulsation, which belongs to the physiological tinnitus. In addition, patients with otitis media, cervical spondylosis will also appear in the left ear tinnitus. In addition, if the patient is exposed to noise for a long time in the environment, excessive earwax in the left ear, head and neck trauma, temporomandibular joint disorders, or the patient using ototoxic drugs, air pressure injuries, hypertension, atherosclerosis, acoustic neuroma and so on can also lead to tinnitus in the left ear of the patient. Tinnitus in the left ear does not indicate a precursor to a serious illness, and it is recommended that the patient seek medical attention in a timely manner. If tinnitus occurs physiologically in the left ear, it can be left untreated. For disease-induced tinnitus, doctors will choose appropriate measures to treat the cause.