Limitation of mouth opening by betel nut eating may be due to fibrous degeneration of oral mucosa, oral cancer, etc. It is necessary to stop chewing betel nut, conduct biopsy of oral mucosal tissues, and surgical treatment if necessary. Frequent betel nut chewing can cause fibrous degeneration in many parts of the oral mucosa, the oral mucosa loses its elasticity and the fibrous tissue proliferates, which will lead to the restriction of oral movement. If there is a limitation of mouth opening, you need to stop chewing betel nut in time to avoid the continuous progress of oral mucosal fibrosis. Often chewing betel nut and having limited mouth opening may also be a sign of oral cancer. It is necessary to go to the hospital for pathological tissue biopsy in time. If oral cancer is diagnosed, surgery can be performed if necessary. If surgery is difficult, local radiotherapy can also be used. If people who chew betel nut frequently have restricted mouth opening, they need to go to the hospital in time to get a clear explanation of the cause of restricted mouth opening, and then carry out targeted treatment and treatment.