Different lesions in the brain can manifest as different symptoms. Brain lesions can be divided into two main categories, irritating lesions and destructive lesions. Stimulating lesions can manifest as seizures, delirium, confusion, etc. Destructive lesions may manifest as drowsiness, somnolence, monoplegia, hemiplegia, quadriplegia, hemianopia, or aphasia, etc. I. Stimulating lesions 1. Abnormal discharges caused by stimulation of local lesions in the brain can cause abnormal synchronous discharges in the cerebral cortex, manifesting as seizures; 2. Second, destructive lesions destructive lesions need to look at the site and extent of the destructive lesions, extensive destructive lesions of the cerebral cortex, can form drowsiness, lethargy and even coma. Usually, local destructive lesions mainly depend on the site of injury.1. If the lesion is located in the sensory center, there will be hemianesthesia or unilateral limb sensory disorder; 2. If the lesion is located in the visual center or conduction pathway, there will be monocular blindness, bilateral temporal hemianesthesia, 1/4 quadrant blindness or hemianopia; 3. If the lesion occurs in the motor area, it will cause movement disorders of the limbs, manifesting as uniplegia, hemiparesis, quadriplegia or If the lesion is located in the speech center, it can cause aphasia, which can be motor aphasia, sensory aphasia, mixed aphasia, or transcortical sensorimotor aphasia or command aphasia.