The causes of mental disorder can be discussed from the aspects of physical factors, psychological factors and environmental factors.

1. Physical factors

include body size, physical strength, nutritional status, health level, disease resistance, recovery or compensation of injury, tolerance to physical strength, energy and consumption, etc. It is not only related to the genetic quality of the body, such as metabolic type, endocrine system function and immune system function, but also related to acquired life experience.

Second, psychological factors

namely temperament and character formed on its background, and unhealthy or susceptible psychological qualities, such as allergic, fragile and introverted personality, are prone to psychological disorders under the impact of harmful external pathogenic factors; The stable, strong and extroverted personality, under the impact of the same external harmful pathogenic factors, often shows high tolerance, without mental disorders.

Third, environmental factors

If the living or studying environment is tense or harsh, it will often have a certain negative impact on psychological development. And it is also possible that because of the pressure, they are unwilling to communicate with the outside world, which may lead to psychological disorders.

Treatment of mental disorder:

1. Reasoning and enlightenment

is to help patients by putting facts and reasoning.

2. Hint therapy

is the simplest and most typical conditioned reflex of human beings, suggesting that patients will be better tomorrow than today; And bad hints can often lead to "iatrogenic diseases" or make patients lose confidence, thus aggravating the condition.

3. Transfer therapy

Also known as distraction therapy, even if the patient's attention shifts to pleasant things, such as listening to jokes and watching TV, it will make the patient feel happy and dilute or forget his troubles.

4. Behavioral therapy

is to guide patients' behaviors, such as reward, punishment and skill training, so that patients can realize physiological changes or organ activities in the body, then learn to control themselves, and finally achieve the purpose of treating diseases.

5. Imagination therapy

is to guide patients to change their attention from distraction to concentration through imagination, and their emotions from instability to stability and calmness, so as to relax their mind and body.