Speaking suddenly tongue not straight refers to unclear pronunciation, tongue movement inflexible, etc., may be alcohol, acute cerebrovascular disease, motor neuron disease and other causes. 1. Acute alcoholism: after drinking alcohol, the central nervous system is easily affected by alcohol, and there is a sudden phenomenon of tongue stroking. 2. Acute cerebrovascular disease: Suddenly the tongue is not straight, you can consider suffering from acute cerebrovascular disease, including cerebral blood supply insufficiency, cerebral vasospasm, cerebral hemorrhage, cerebral infarction and other cerebral diseases, which will damage the patient’s language coordination nerve, affecting the normal speech. 3. Acute motor neuron injury: speak suddenly tongue not straight also consider motor neuron injury, at this time there will be swallowing difficulties, chewing weakness and other symptoms. In the case of talking without drinking alcohol suddenly tongue not straight, it is recommended to pay attention to, should go to the hospital in time.