How to fully understand sub-health?

To understand sub-health scientifically, it is necessary to distinguish sub-health from related medical problems: First, sub-health is different from subclinical: although sub-health overlaps with upstream health status and downstream disease status, the distinction is also obvious. Subclinical is subjective examination evidence without obvious clinical manifestations, such as subclinical carotid atherosclerosis in middle-aged and elderly people, obvious carotid intima-media thickening and even plaque formation without clinical manifestations; However, people in sub-health state complained of headache, dizziness and chest discomfort, but there was no abnormality in vascular echocardiography and electrocardiogram. Second, sub-health is not equal to chronic fatigue syndrome (CFS). First of all, CFS has an international unified standard, but sub-health has not; Secondly, the incidence of CFS in adults over 18 years old is only 0.004%, while the incidence of sub-health is 70%, which is very different. Furthermore, most of the sub-health states described in China can be recovered through active intervention, while only 30% of CFS can be recovered.