Psychosomatic Medicine (PM) is a science that studies the interrelationship between the mind and the body, focusing on the etiology, pathology, diagnosis and prevention of psychosomatic diseases (i.e. psychosomatic disorders). In the past, people’s understanding of health simply referred to the disease-free state of the body, and as long as the body (physical body, including tissues, organs, and cells) was free of disease, it was called healthy. Later on, people gradually discovered that the occurrence of many diseases is not simply a factor of the body itself, but is related to a variety of factors such as social, psychological, and emotional changes. In the mid-1980s, the World Health Organization (WHO) gave a new definition of health: “Health is a condition in which all three aspects of physical, psychological and social adaptation are good, not just the absence of disease or physical fitness”. Psychosomatic medicine believes that the physical and mental conditions of the human body are closely intertwined and therefore both aspects must be considered in the diagnosis and treatment of disease. Practitioners with some clinical experience understand how important the patient’s own strong sense of wanting to be cured and “hope” plays in the later stages of recovery. At the same time, the relationship of trust between the physician and the patient is very important, and the attitude of the physician is sometimes more effective than the effectiveness of the medication. Because of the different perceptions of the so-called “heart” and its unmeasurable nature, it has been a difficult area to study in depth in modern science. Therefore, it has been difficult for modern medicine (Western medicine) to deal with the “heart” aspect of disease for a long time, limiting itself to the tissues, organs, cells and molecules of the body. (We will discuss the concept of “heart” later.) Even in the United States, the birthplace of the concept of psychosomatic medicine, only a few years ago there were people who laughed at the idea that mental factors could cause disease. But with the development and advancement of brain physiology, neurochemistry, and immunology, there are more and more theories and experiments that validate the validity of psychosomatic medicine. For example, statistics show that single people and widowed people are 5-10 times more likely to develop cancer than people living in normal marriages, and the so-called “carcinogens” that cause cancer are believed to be caused by “loneliness”. The so-called “carcinogenic substance” that causes cancer is thought to be caused by “loneliness”, because it is known that worry can reduce the activity of immune cells such as Natural killer cells that inhibit the development of cancer. At the same time, anxiety and restlessness also affect the autonomic nervous system, the endocrine system and the immune system. People can cause an increase in blood pressure when they are emotionally agitated, which is a typical example of mental factors causing objective pathological changes in the human body. In addition, emotional depression can cause stomach discomfort and loss of appetite, which has now been shown to be the result of congestion of the gastric mucosa caused by emotional depression. All these show that the physical condition of human body is influenced by social and mental factors. In modern society, competition tends to be fierce, society is more complex, and the mental pressure from family and work will be greater. Therefore, from the perspective of development, the scope of psychosomatic medicine will increase, and the number of people suffering from psychosomatic diseases will also increase, and it should be said that more than 50% of the people need to receive psychosomatic treatment. With the improvement of living standards and medical treatment, the diseases that harm human beings have changed from infectious diseases to diseases caused by mental and psychological stress. Therefore, psychosomatic medicine will cover the vast majority of modern medical fields.