Having cancer will not get better by itself. If cancer is diagnosed, it will not heal by itself without treatment. Cancer is a malignant tumor originating from epithelial tissues, which is classified into low malignancy, moderate malignancy and high malignancy according to the degree of malignancy, and the course and survival period of cancer patients will be very different according to the degree of malignancy. A few low-grade malignant tumors, such as papillary thyroid cancer, can be stable for more than 10 years without treatment if they are early staged, highly differentiated and have low malignancy. For example, if lymphoma of low malignancy, which is commonly known as lymphoma, if the stage is early and the lesion is inert, some patients can also have stable long-term disease for more than 10 years without treatment. In conclusion, cancer will not get better by itself without treatment, but there are some patients with low-grade malignant cancer who can survive for a long time without treatment.