No, not all of us have cancer cells in our bodies. Our bodies are continually generating new cells, some of which have the potential to develop into malignant tumors. We may be making cells with damaged DNA at any given time, but it doesn't guarantee they're doomed to develop cancer. Cells that contain mutated p53 genes are likely to become cancerous if they are not removed by natural processes such as cell death or immune system attacks. However, this does not mean you will get cancer. Cancer is a term used to describe an ensemble of diseases in which abnormal cells divide without control, forming a mass of tissue that can invade other parts of the body. Cancer cells can grow and spread through the body where they cause irritation and inflammation without causing symptoms until they have grown large enough to do so. Then they can trigger health problems that include pain, fever, and fatigue.