What is the most serious level of mental illness?

Mental illness is a disease we are familiar with. Mental patients have different degrees of illness, and serious ones should be treated. If there is a problem with the human nerves, treatment methods should be studied in a timely manner. Moreover, mental illness can be divided into levels, and the severity of each level is different. So what people often want to know is what level of mental illness is the most serious?

Mental disability level 1:

Severe adaptive behavior disorders; completely unable to take care of oneself and ignoring one's basic physiological and psychological needs. You can’t interact with people, you can’t do your job, and you can’t learn new things. The environment needs to provide comprehensive and extensive support, and life needs to be long-term and fully supervised by others.

Mental disability level 2:

Severe disorder of adaptive behavior; unable to take care of oneself for most of the time, basically does not interact with others, only interacts with caregivers in a simple way, can understand simple instructions from caregivers, and has certain learning ability. Able to perform simple labor under supervision. Able to express their basic needs and occasionally participate passively in social activities; require extensive support from the environment and still need care from others for most of their lives.

Mental disability level 3:

Moderate disorder in adaptive behavior; unable to take care of oneself completely in daily life, can have simple communication with others and express one's emotions. They can independently perform simple labor and learn new things, but their learning ability is obviously worse than that of ordinary people. Passively participate in social activities, and occasionally actively participate in social activities; the environment needs to provide partial support, that is, the support services needed are regular and short-term needs, and part of life needs to be taken care of by others.

Mental disability level 4:

Mild disorder in adaptive behavior; can basically take care of himself in life, but his self-care ability is worse than that of ordinary people, and sometimes neglects personal hygiene. Able to interact with others, express their own emotions, but have poor ability to understand other people's emotions. Able to do general work, and their ability to learn new things is slightly worse than that of ordinary people. They occasionally need support from the environment, but generally do not need to be taken care of by others in their lives.