(1) Functional changes, not organic lesions.
(2) Signs change, but the existing medical technology can't find the lesions.
(3) Poor quality of life and low health level for a long time.
(4) Unhealthy signs of chronic diseases outside the lesion site.
Whether sub-health develops into a serious organic disease is uncertain. However, sub-health itself is a problem that needs to be solved.
Sub-health of physical growth: Overnutrition and nutritional imbalance coexist, and students' physique is weak.
Sub-health of psychological quality: the pressure from family and school has caused teenagers' rebellious psychology, repetitive psychology, inferiority complex and weariness of learning. And their ability to resist setbacks is very poor.
Emotional sub-health: They should care about society and be enthusiastic about life, but in fact they are indifferent to many things, which makes their "psychological airspace" narrower and narrower.
Sub-health: superficial, fragile and unstable, easy to accept external stimuli and change yourself.
Behavioral sub-health: manifested as behavioral stylization, it is easy to produce behavioral extremes after a long time.