Tumor screening can be done by hanging out with an oncologist because oncologists know that each age group has tumors that are prevalent in each age group and can adopt appropriate screening strategies to screen for tumors. For example, middle-aged and older men with a long history of smoking can have a CT of the lungs to rule out lung cancer. For middle-aged and elderly women, they should pay attention to screening for breast cancer and cervical cancer, and ultrasound or CT examination can be used to screen for breast cancer and cervical cancer. For digestive system tumors such as gastric cancer and colorectal cancer, common manifestations such as blood in stool, positive stool OB test, rectal palpation, etc., the corresponding examination strategies are familiar to every oncologist. Therefore, tumor screening can be performed in the oncology department, and the oncologist will arrange the appropriate screening strategy.