As the society enters into the 21st century, the increasing pace of life in modern society has put some in the working class at a state of overload. Sub-health condition has already been considered as the new killer of human health. The reason that many of our scientists and entrepreneurs in this country die at their peak age is due to overwork that results to diseases. Therefore, it is very critical to prevent fatigue syndrome and actively take effective measures. 

The characteristic of sub-health condition is that it occurs between the ages of 20 and 50, and is more prevalent to groups of higher educational level. The formation of this disease can be either acute or chronic. The condition of the sickness can last for several months or even years. A patient suffering from this condition has low work efficiency. Some cannot even continue their work or study, thereby affecting their relationship with family members and society. The cause of this condition is work overload on the bodily systems - the energy is overused. As a result, it causes the ischemia and hypoxia in tissues and organs, and increases production of fatigue products such as carbon dioxide, lactic acid, non-protein, etc. generated during the process of metabolism of the organism. "Fatigue" reduces the body's immunity and weakens its ability to resist diseases. Aside from possibly contracting various chronic diseases, the person is more likely to be affected by various infectious diseases. 

Chinese medicine believes that health is a dynamic equilibrium between man and his natural environment as well as society. "Only when yin and yang is in equilibrium that the vitality is activated". Sub-health and diseases belong to the non-equilibrium state among the yin, yang, and ying and wei of viscera of the human body. The causes of the diseases include internal damages of the seven emotions, fatigue, excessive food, irregular daily activities, unsatisfied aspirations, undisciplined work and rest, lack of sleep, over fatigue, lack of exercise, abusive drinking and smoking, etc. In addition, exopathogen, six exogenous phathogenic factors, and pathogenic toxin (such as environmental pollution, etc.) are also causes of the sickness. 

The main syndromes for sub-health condition is manifested by bodily fatigue, difficulty in recovering after rest, body-ache, dizziness with headache, sleep disorders, lack of appetite, insomnia, lots of dreaming, palpitation, depression, anxiety, stress, fear, bad temper, and unsociable and eccentric behavior. Some serious patients suffer from low self-esteem with no desire for progress, loss of memory and concentration, and low efficiency in work and study. 

Chinese medicine believes that healthy lifestyle, behavior, and work methods are the best way to improve quality of life. Pay attention to any emerging condition of sub-health, and promptly treat the sickness, so that the "yin and yang is in equilibrium" and balanced viscera function can be achieved. Only then will life flourish and become lasting.