The Clinical Guide of Sub-health Chinese Medicine issued by China Society of Traditional Chinese Medicine points out that sub-health refers to a state between health and disease. People in sub-health state can't reach the health standard, which is characterized by the decline of vitality, function and adaptability in a certain period of time, but it doesn't meet the clinical or subclinical diagnostic criteria of modern medicine.
According to the clinical manifestations of sub-health state, it can be divided into the following categories: ① Physical symptoms such as fatigue, sleep disorder or pain are the main manifestations; ② Mental and psychological symptoms such as depression, anxiety, impatience, fear and timidity, or short-term memory loss and inattention are the main manifestations; ③ The decline in the frequency of interpersonal communication, or the decline in social adaptability such as interpersonal tension are the main manifestations. If any one of the above three items continues to attack for more than 3 months, and the diseases that may lead to the above performance are ruled out by systematic examination, they can be judged as sub-health in physical, psychological and social communication respectively. Clinically, the above three sub-health manifestations often coexist. -Baidu Encyclopedia