Parotid nodules are usually caused by diseases such as mumps, parotid duct stones, enlarged lymph nodes, and tumors. 1. Mumps: Mumps is an acute respiratory infectious disease, which is caused by infection of the parotid gland. It mainly causes symptoms such as swelling and pain in the parotid area, which can cause symptoms of parotid nodules. 2. Parotid Duct Stones: Parotid duct stones are formed when the parotid ducts are blocked and the secretion of fluid is not discharged properly, which will cause blockage of the parotid ducts, enlargement, and symptoms of parotid nodules. 3. Enlarged lymph nodes: parotid nodules in lymphatic patients may be caused by enlarged lymph nodes in the parotid area, which will cause symptoms of parotid nodules and pain. 4. Tumor: Patients suffering from parotid gland neoplastic disease usually cause parotid gland growth and swelling, accompanied by pain, nodules and other symptoms. There are many other causes of parotid nodules, patients should go to the hospital in time for examination and symptomatic treatment under the guidance of doctors.