What exactly is cancer? What can cause cancer to occur? To understand what is “cancer”? Then we should first understand what is “health”? In fact, commonly speaking, health is a state of being. Traditional Chinese medicine has always emphasized the correspondence between heaven and man, and believes that human life activities are closely related to the natural environment, and the essence of human life lies in yin and yang. The nine orifices, the five Tibetan bodies and the twelve sections of the human body are all connected to the weather. In order to maintain a healthy state, we must conform to the weather, only in this way, the yang energy can be protected, so that the evil energy cannot harm people; if we cannot conform to the natural laws of heaven and earth, the righteous energy will be damaged, and a “disease state” will appear. Modern medicine also believes that health is a state of being. Many modern studies show that health is a state of balance in all aspects, such as acid-base balance, static balance, psychological balance, etc. The Dutch scholar Spino has made an insightful statement on health: maintaining health is the responsibility of being a human being. A healthy body is not only a personal need, but also a need of family and society. With the development and progress of society, the concept of “health” is constantly updated. Before 1948, people thought that being free from disease was healthy. When the World Health Organization was founded, the definition of health was “not only the absence of disease and infirmity, but also a state of perfect mental adaptation to a competitive society.” If we talk about “state of health”, it is easy to understand what is “cancer”? “Cancer is also a state, a state of imbalance between human and nature, between the internal organs of the human body. As a simple example, we all know the relationship between seeds and soil. Different seeds are suitable for different soils, thus forming different plants, and the same seed growing in different soils will also change. In the early Qin Dynasty, Yan Zi of Qi once said, “If an orange is born in Huainan, it is an orange, but if it is born in Huainan, it is a hedgehoven. What is the reason for this? Water and soil is also different.” This quote from the ancients confirms this truth, the sweet orange transplanted to Huainan becomes bitter and unpalatable hedgehoven in Huainan, for no other reason than the soil and water has changed. In fact, the occurrence of “cancer” is not like this. If the human body is in a healthy state, it is like having fertile land and sufficient water, the seeds will thrive, otherwise, it is useless even if the soil is not good and the variety is not good, and finally, it will not grow well and only change to produce “cancer”. In order to prevent and control cancer, we must change the “cancer state” and the “cancer environment” that produces “cancer cells”. Modern treatment, whether surgery, chemotherapy or radiotherapy, are all stopgap methods. These aggressive methods only temporarily kill cancer cells on the surface, but at the same time, they further deteriorate the internal environment and intensify the “cancer state”, thus laying the groundwork for the metastasis and recurrence of cancer.