There are very many reasons for damage to the prefrontal lobe of the brain, and the more common ones are the following: 1. Cerebrovascular disease. Cerebrovascular disease is the most common cause of frontal lobe damage in the elderly, which can be frontal lobe infarction or frontal lobe hemorrhage. 2, inflammation. Encephalitis is another common cause of frontal lobe damage, of which herpes simplex virus encephalitis is the most common, there will be both frontal and temporal lobe involvement, with mental disorders, seizures, cognitive impairment as the main performance. 3, tumor. Tumors and occupancies in the frontal lobe can cause frontal lobe damage, either primary tumors in the brain, such as glioma, or tumors metastasized from other parts of the brain, more likely to occur in the subcortical areas, such as lung cancer brain metastases. 4, traumatic brain injury. Trauma can directly cause frontal lobe damage, commonly brain contusions with secondary subarachnoid hemorrhage.