①The main symptoms were fatigue, sleep disorder, or pain;

②The main symptoms are depression, anxiety, irritability, fear and timidity, or short-term memory loss, and inability to concentrate;

③It is mainly manifested by the decrease in interpersonal communication frequency or the decrease in social adaptability such as interpersonal tension.

Any one of the above three conditions that have lasted for more than 3 months, and the disease that may cause the above performance has been excluded through systematic examination, can be judged to be in physical sub-health, mental sub-health, and social sub-health. Clinically, the above three sub-health manifestations often occur simultaneously.

Differential diagnosis

Some scholars believe that sub-health and chronic fatigue syndrome abroad is the same thing. Both are studies on a group of physical and psychological symptoms characterized by chronic fatigue, but some scholars hold different opinions.

In 1994, the International Research Group on Chronic Fatigue Syndrome (led by the United States and jointly composed of researchers from Australia, the United Kingdom, and other countries) revised the diagnostic criteria for chronic fatigue syndrome.

Definition of chronic fatigue syndrome

Chronic fatigue that is clinically assessed, unexplained, persistent, or recurrent, and lasts for 6 months or longer. The fatigue is new or has a definite beginning (not lifelong); It is not the result of continuous exertion; It can not be obviously relieved after rest; As a result, the ability to work, study, and social or personal activities has significantly decreased compared with the previous.

Diagnostic criteria

Chronic fatigue that is unexplained, persistent, or recurrent through clinical evaluation, which is new or has a definite onset time, is not congenital, is not caused by the work being done, and cannot be obvious after rest, and the patient's professional ability, educational ability, social ability, and personal life have a substantial decline compared with those before the disease;

Among the following symptoms, at least 4 symptoms occur at the same time, not before fatigue symptoms, and the symptoms continue or recur for at least 6 consecutive months.

（1）Short-term memory or concentration decreased significantly;

（2）Sore throat

（3）Enlarged neck or axillary lymph nodes;

（4）Muscle pain;

（5）Multiple joint pain, but not accompanied by redness and swelling;

（6）Headache, but the attack type, mode, and severity are different from those in the past;

（7）Unable to recover energy after sleep;

（8）Discomfort continued for more than 24 hours after exercise.