Carotid artery occlusion can be categorized into acute carotid artery occlusion and chronic carotid artery occlusion, which can be manifested as aphasia, loss of motor and sensory functions of the partial limb, blindness, impaired consciousness, dizziness, memory loss and other symptoms. 1. Acute carotid artery occlusion: It leads to large cerebral infarction with severe clinical symptoms. It may manifest as aphasia, loss of motor and sensory functions of the lateral limbs, blindness, impaired consciousness, etc. With the occurrence of cerebral edema, the cranial hypertension is further elevated, which may lead to cerebral hernia and endanger the life. 2. Chronic carotid artery occlusion: most patients with chronic carotid artery occlusion generally have established collateral circulation, so there can be no obvious clinical manifestations, but can also be manifested as chronic cerebral ischemia symptoms, such as dizziness, memory loss and so on. Patients with carotid artery vascular occlusion are advised to seek medical advice and treatment in a timely manner.