The cause of parotid gland cancer is not clear yet, which may be due to infectious factors, mental factors, hereditary factors and so on. 1. Infectious factors: If the resistance drops or the parotid gland has chronic inflammation, which leads to chronic infection, it may lead to parotid adenocarcinoma. Normally, you need to develop good living habits, eat reasonably, don’t stay up late, don’t smoke and don’t drink alcohol, so as to reduce the chance of cancer. 2. Mental factors: the pressure and emotion brought by life, emotion and work are all mental factors. These factors may lead to parotid cancer. You should pay attention to the reasonable regulation of personal emotion to avoid the damage of body health caused by bad emotion. 3. Hereditary factors: parotid cancer may be caused by hereditary factors, usually when parents suffer from this disease, the risk of children’s disease increases. When you find parotid cancer or have the possibility of parotid cancer, you should go to regular hospitals in time for early detection, early diagnosis and early treatment to avoid delaying your condition.