Posterior circulation ischemia may also cause tinnitus. Tinnitus, also known as cranial tinnitus, is a sensation of buzzing or roaring in the brain. Tinnitus is most common in middle-aged and elderly people, especially in patients with atherosclerosis of the blood vessels in the brain, which causes blood flow to impact the walls of the blood vessels, and the patient feels tinnitus subjectively. Posterior circulation ischemia refers to insufficient blood supply to the vertebrobasilar artery of the brain, resulting in ischemia and hypoxia of brain tissue. When posterior circulation ischemia affects the blood supply of the internal auditory artery, tinnitus can occur. In posterior circulation ischemia, cranial CT and cranial MRI usually have no clear abnormal changes. When tinnitus occurs in posterior circulation ischemia, the blood circulation in the brain should be improved first, and those with atherosclerosis usually use anti-platelet and plaque stabilizing drugs, such as aspirin, Polivir, Tegretol, and so on. In addition, patients should avoid staying up late and quit bad habits, such as smoking and drinking. Patients whose posterior circulation ischemia can cause tinnitus are advised to seek professional help in the hospital.