Cerebral thrombosis and cerebral embolism are both strokes, both are cerebrovascular lesions that cause brain dysfunction and are common diseases of the nervous system. The differences between them are as follows: 1. Cerebral thrombosis is mainly caused by atherosclerosis of the main brain artery or cortical branch arteries, resulting in thickening of the blood vessels, narrowing of the lumen, occlusion and thrombosis, causing a decrease in local blood flow or interruption of blood supply to the brain, resulting in necrosis of brain tissue due to ischemia and hypoxia. It usually occurs in the elderly and develops at night when they are sleeping or resting at noon, mainly manifesting as hemiparesis, hemianesthesia, and hemianopia. 2. Cerebral embolism is caused by external reasons such as rheumatic heart disease, which forms peripheral blood clots that flow into intracranial arteries, such as the middle cerebral artery, causing the blood vessels to be blocked, resulting in ischemic necrosis of the brain tissue supplied by this vessel. Most of them occur in adolescents and start during activities. The disease is very sudden, and symptoms such as hemiparesis, headache, vomiting, and loss of consciousness may occur.