Oral submucous fibrous lesion is not necessarily cancer. 1. Oral submucous fibrous degeneration occurs mostly in people aged 20~40 years old, which is caused by many reasons, such as nutritional deficiencies, betel nut chewing, etc., and is mostly found in India and other Asian regions. The World Health Organization classifies oral submucous fibrosis as a precancerous condition, which is considered to be at risk of cancer, but it does not mean that the presence of this symptom is cancer. 2. Oral submucous fibrous degeneration mainly refers to abnormalities in oral function such as hardening of the mucosa and restriction of mouth opening due to lesions in the fibrous tissue of the lamina propria of the oral mucosa. The disease can occur in the cheeks, lips, pharynx, soft palate, the floor of the mouth, etc. Common symptoms include pain in the oral mucosa, whitening of the mucosa, pouching of the soft palate, loss of taste, dysphagia and other symptoms. After the emergence of oral submucosal fibrous degeneration, we should go to the hospital in time for examination, to clarify the cause of the disease, and carry out targeted treatment as soon as possible, in order to prevent the aggravation of the disease, which may lead to danger.