Cancer may cause loss of taste, but loss of taste may also be due to the adverse reaction of cancer radiotherapy, or it may be caused by bad dietary habits or oral diseases. 1. Cancer: Cancer of the oral cavity or nasal cavity can lead to loss of taste, which is mainly caused by impaired function of the tongue or nasal cavity due to tumor invasion, resulting in loss of taste or loss of taste; 2. Mucositis and other side effects caused by cancer radiotherapy or chemotherapy can also lead to loss of taste; 3. bad dietary habits: patients who consume spicy and stimulating foods with high salt content for a long time can also suffer from hyposmia or loss of taste; 4. oral diseases: patients with long-term oral unhygienic, oral ulcers, causing oral inflammation. If the inflammation is not effectively treated for a long time, it will cause hyposmia. Patients with symptoms of hyposmia, must be timely examination and treatment, so as not to delay the condition.