Reasons for feeling inflexible tongue: First, rule out the existence of suspicious swelling in the oral cavity, tumors growing at the root of the tongue are not easy to find and can also affect the normal activities of the tongue, which requires timely surgical removal at the stomatology department. Second, consider whether there is a betel nut chewing habit, chewing betel nut will stimulate the oral mucosa and soft tissue fibrosis, also called fibrosis, oral mucosa and tongue will lose elasticity, affecting the activity, there is a bad habit of betel nut chewing, need to timely quit, can use anti-inflammatory spray gradually relieve, the tongue lost elasticity is difficult to fully recover. Thirdly, pay attention to whether there is a lesion in the brain, such as a swelling compressing the lingual nerve or the brain nerve, which needs to be seen in neurology and neurology.