Malignant tumors are increasingly ranked as the cause of human death, but some tumors grow in hidden areas and often do not have particularly obvious symptoms, which are difficult to detect until a certain volume. Many people want to know whether they have tumors or not. Nowadays, medical science has been trying to find ways to find some tumor-specific indicators, such as CA125 for ovarian cancer, PSA for prostate cancer and so on. However, there are still many malignant tumors that cannot be detected early by blood sampling. When a certain size of tumor will show some symptoms or signs, it is necessary to rely on imaging, that is, ultrasound, X-ray, CT, MRI or even PET-CT, and so on. However, imaging can only detect the tumor, but it cannot determine whether it is benign or malignant. It depends on pathology, taking the tissue cells of the tumor and seeing if its structure is changed under the microscope. The medical checkups for cancer include: 1. screening items: tumor markers, breast scan, cervical smear, etc.; 2. further examination items after symptoms or positive test results: CT, X-ray chest film, MRI, etc.; 3. confirming items when “highly suspicious”: pathological tissue biopsy.