The main reasons for the patient’s crooked mouth are as follows: 1. Consider acute cerebrovascular disease, if the patient suddenly develops symptoms such as crooked mouth, clumsy language, drooling and inflexible limb movement, it may be transient cerebral ischemic attack, cerebral hemorrhage, cerebral infarction and other diseases, which require immediate hospital examination and treatment. 2. The patient’s facial palsy may be caused by intracranial tumor or intracranial occupancy compression, which is slow to start, but the symptoms persist and progress and worsen, and may be accompanied by headache.