If a patient’s blood pressure is not high but he or she has dizziness and brain swelling, the following causes are mainly considered: First, it is also the most common in daily life. Usually, people are prone to dizziness and brain swelling when they are not well rested, do not get enough sleep, work under stress, or have environmental factors such as poor air circulation, hot and noisy environment. Secondly, although blood pressure is not high, dizziness and swelling may also be caused by cerebrovascular problems, such as the narrowing of blood vessels in patients with cerebral blood supply deficiency, coupled with high blood viscosity, causing slow cerebral blood flow, then patients will show dizziness, brain swelling, memory loss and other performance in daily life. By combining the patient’s blood pressure is not high, but the triggers of dizziness and brain swelling occur, as well as the related physical condition, examination and signs, a certain determination can be made.