Nerve adhesions are caused by the following conditions: First, because of inflammation, such as common meningitis, encephalitis, or neurofibrillary adenitis, etc. When there is such inflammation, there is often a certain amount of exudate and secretory material formed that can remain between the nerves or nerve cells, which can lead to nerve adhesions over time. Second, it may be due to congenital developmental abnormalities, or malformations, which are relatively rare, but can also lead to neural adhesions. Third, it may be due to cerebrovascular lesions, such as common cerebral thrombosis, brain tumors, cerebral hemorrhage or cerebral aneurysm, which can also lead to neurological adhesions. Fourth, it may be due to abnormal brain nerve development, such as abnormal branches of brain nerves or mutations between brain nerves, which can also lead to brain nerve adhesions.