There is no such thing as “the top ten least serious cancers”. Generally speaking, early papillary thyroid cancer, inert lymphoma and other diseases have a higher cure rate and a relatively good prognosis. Cancer is a group of malignant diseases caused by a combination of internal and external factors such as heredity and environment. After the disease, cancer cells will continue to erode organs and tissues, causing damage to the body and endangering the patient’s life, so all cancers are more serious. However, for cancers with higher degree of differentiation and lower degree of malignancy, such as papillary thyroid cancer, and slower developing inert lymphomas, such as follicular lymphoma, the cure rate is often higher, and can reach more than 90% in early stage. Therefore, it is suggested that patients should actively cooperate with doctors for treatment in time after diagnosis in order to prolong the survival time and improve the prognosis.