Mixed tumors of the submandibular gland are tumors formed by two or more biological tissue structures. For example, embryonal tumors of the oral and maxillofacial region. 1. Mixed tumor of submandibular gland often occurs in the submandibular gland, maxilla and mandible, intraoral minor salivary glands, salivary glands, face and neck and other parts of the tumor. It often occurs in women around 40 years old, and the clinical manifestation is painless lump with smooth surface and slow growth under and in front of the ear. 2. Mixed tumor of submandibular gland may be caused by immune status, genetic factors, endocrine factors and neuropsychiatric factors, etc. Parotid gland is a benign tumor of parotid gland, and the biological behavior of mixed tumor is more likely to recur. Patients with mixed tumor of submandibular gland should go to the hospital in time, after clarifying the cause of the disease, under the guidance of the doctor to carry out regular treatment.