The diagnosis of dizziness needs to be made in conjunction with the nature of the dizziness, the duration of the dizziness, and the accompanying symptoms of the dizziness. If necessary, imaging tests or blood tests are also required. The first clinical consideration for a man in his 50s with frequent dizziness is posterior circulation ischemia. It is recommended that the patient should visit the neurology clinic of the hospital in time to improve the cranial CT or MRI of the skull to understand the intracranial situation. In addition, screening tests for blood count, blood glucose, lipids and blood pressure should be performed to identify risk factors for the patient. After completing the examination, the diagnosis will be clarified and the treatment will be appropriate.