A self-mutilation or self-abuse person is self-mutilation or self-abuse because he is forced by too strong instinctive needs, and he is eager for direct satisfaction, while complex reason lacks normal means to meet these needs. Therefore, complex rationality has to return to it, in order to achieve a temporary balance between individual physiology and psychology, and make the image model of the individual centered and correct.
Seek help from rational mode and seek comfort in reality in a special way of self-harm or self-abuse. This is the mechanism of self-harm or self-abuse. Because in self-harm or self-abuse, subconscious desires and their derivatives can't be carried out in the normal state.
We can only break through in a twisted way of self-harm or self-abuse, and seek limited satisfaction in unnatural behaviors that do not meet the requirements of social morality and habits. It can be seen that self-harm or self-abuse has seriously disturbed or even distorted the function and function of consciousness to some extent, which is a mechanism to adapt to abnormalities in one's psychological development.