The recovery time after a brain nerve injury cannot be generalized, but needs to be judged in conjunction with the cause and severity of the nerve injury. There are many causes of brain nerve injury, including traumatic injury, vascular origin injury, tumor injury, surgical invasion injury, etc. Generally speaking, if the nerve injury is caused by trauma, malignant tumor or surgical invasion, it is generally difficult or even impossible to recover. In contrast, if the brain nerve injury is caused by cerebrovascular disease, more can try to use drugs to improve circulation, dilate blood vessels, nerve nutrition, dehydration and reduce edema, but the specific recovery time is related to the severity of the nerve injury, generally ranging from several months to several years. It is important to note that nerve cells cannot be regenerated after death, so early and timely treatment of the primary cause of brain nerve injury is crucial. In case of trauma, prompt medical attention should be sought and surgical treatment, such as nerve decompression and nerve reconstruction, can be performed to restore some nerve function.