Usually the twitching of the right corner of the mouth is caused by the following reasons: 1. The most common factor is facial muscle spasm, facial neuritis recovery period, the clinical symptoms and performance of twitching and jerking of the right corner of the mouth when the trigeminal nerve is stimulated. 2. Common non-infectious factors usually also lead to twitching of the corner of the mouth, such as connective tissue disease, autoimmune disease, dermatomyositis, etc. will appear twitching of the right corner of the mouth. 3. Cerebrovascular disease also often appears as a secondary sequel to the twitching of the right corner of the mouth.