Benign tumors generally grow slowly and swell up. Smaller tumors will not show pressure symptoms, and patients can be fully capable of daily work, life and labor. When the tumor continues to grow and presses the surrounding important organs and organs, corresponding symptoms will appear, but the risk is relatively low compared with malignant tumor; malignant tumor grows faster and can quickly appear distant metastasis and local metastasis, if it invades the surrounding important organs, it can cause treatment difficulties and affect the life expectancy of patients.