Dyslexia is caused by damage to the angular gyrus in the temporal lobe of the brain, which is the center of visual language in humans, also known as the reading center. Because of its proximity to the visual center, when the center is damaged, the patient is not able to understand the meaning of words and symbols although there is no visual impairment, which is also known clinically as aphasia. It is part of sensory aphasia, and the lesion is located mainly in the temporal lobe, and due to damage to the angular gyrus of the temporal lobe, the patient may present with alexia. For this kind of aphasia, it is recommended to give treatment according to the cause. If it is caused by ischemic cerebrovascular disease, it is recommended to give symptomatic treatment such as anti-platelet aggregation, activating blood circulation and improving circulation. If it is caused by cerebral hemorrhage, it is recommended to give conservative or surgical treatment according to the amount of hemorrhage, and if it is an occupancy of the temporal lobe, it is recommended to give surgical resection treatment if necessary.