Transient bad tongue may be caused by lingual inflammation, cerebrovascular disease, neurological dysfunction and other reasons. 1. Tongue inflammation: chronic pharyngitis, pharyngitis and other inflammatory diseases cause non-specific or chronic infection of the back of the tongue, resulting in congestion and swelling of the mucous membrane of the tongue, resulting in motor and sensory dysfunction, and transient inability of the tongue to bend. 2. Cerebrovascular diseases: transient cerebral ischemia, lacunar cerebral infarction and other cerebrovascular diseases lead to cerebral blood flow blockage and insufficient cerebral blood supply, which leads to the restriction of hypoglossal nerve function, and the situation that the tongue is not good enough to bend transiently. 3. Neurological dysfunction: patients with neurological dysfunction leading to paralysis of the hypoglossal nerve, resulting in atrophy or paralysis of the tongue muscle, so that the flexibility of the tongue muscle decreases, and may also appear in the case of the tongue transiently not good enough to make a bend. If the discomfort of the tongue can not be relieved in time, you should go to the hospital in time, under the guidance of the doctor’s clear diagnosis and correct treatment.