I once read a very interesting report about the autopsy report of British long-lived elderly people found that they all had cancer cells in their bodies. From this to clinical work, sometimes the factors of tumor development and their prognosis are hard to be explained by the existing medical knowledge: very early stage, timely and thorough treatment, but still poor results; very late stage, give up treatment, the tumor is still there, but alive and with good quality of life. In my opinion, there are cancer cells in every human body, the key lies in whether it is active or not, whether it develops or not. Then how to make it inactive and not to develop? The key is to master the balance. Everyone’s immune system and disease system need a balance. If you master it well, you can keep away from diseases and cancer. What should we do in case we are unfortunate enough to have cancer? The key is still to master the balance of the immune system and the disease system. In the past, our predecessors taught us surgery, chemotherapy, radiotherapy, and the need to eliminate tumors at all costs. Patients and their families were worried, uneasy and actively requested for treatment. So, we often see: life goes on, chemotherapy goes on. Times are changing and so are the concepts. Whether you are physically healthy now or not, the key is to maintain your mental health and keep your psychological balance. Life is changeable, and we have no control over birth, old age, sickness, death, natural or man-made disasters. The only thing we can control is our mood. Choose a splendid mood to face life and savor it. Don’t believe? Try it!