Tinnitus on the left side is not a precursor of any kind of disease, but can occur in a variety of diseases, such as otitis media, otitis externa, Meniere’s disease, etc., and can also be caused by other diseases such as high blood pressure. 1. Otitis media: Due to bacterial and viral infections, otitis media can cause hearing loss, tinnitus, ear pain and other symptoms, resulting in tinnitus on the left side of the ear. 2. Otitis externa: Otitis externa is caused by pathogen infection, the patient’s main symptoms are swelling of the ear canal, ear stuffiness, hearing loss, pain and so on, which leads to the patient has left-sided tinnitus performance. 3. Ménière’s disease: Ménière’s disease is considered to be caused by endolymphatic production and absorption imbalance, the patient manifests vertigo, hearing loss, tinnitus, ear stuffiness and swelling, resulting in patients with tinnitus on the left side of the symptoms. 4. Other: High blood pressure, neurodeafness, acoustic neuroma and other diseases may also lead to tinnitus on the left side of the patient’s symptoms. Tinnitus on the left side of the ear may be caused by diseases, patients should consult a doctor in time to find out the cause of the disease and treat the symptoms.