Dizziness and tinnitus may be caused by inadequate blood supply to the brain or by hypertension. Inadequate blood supply to the brain includes inadequate blood supply to the internal carotid artery system and inadequate blood supply to the vertebral basilar artery system. Insufficient blood supply to the internal carotid artery system may result in blackness before the eyes, tinnitus, deafness, somatosensory impairment, motor dysfunction, and possibly speech dysfunction. In the case of insufficient blood supply to the basilar artery system, dizziness, nausea, vomiting, and also dizziness may occur, with some patients exhibiting balance disorders and ataxia. If blood pressure is elevated, headache, dizziness, nausea, and vomiting can also occur, and in severe cases, cause hypertensive encephalopathy with tinnitus, confusion, etc. Cerebral atherosclerosis, at the same time, can cause atherosclerosis of the blood vessels in the ear, which can lead to impaired blood supply to the ear and manifest as deafness and tinnitus.