The Madness

People often thinks that Madness is a mental illness. But sometimes is more than that, It  is a mental disorder.
A "mental disorder" is difficult to define. Generally speaking , mental disorders are conditions that involve either loss of contact with reality or distress and impairment. These experiences may pass undiscovered in the life and it's impossible to define the point at which they become pathological. Furthermore, concepts such as schizophrenia, depression, and personality disorder listed in classifications of mental disorders may not in fact map onto any real or distinct disease entities; even if they do, the symptoms and clinical manifestations that define them are open to subjective interpretation.

However there are people that think they are not mad or ill and his brain doesn't accept those thoughts and it erase  them from their mind, making them totally not remember what happened, sometimes it is due to the mental shock or trauma they suffer or suffered and this makes them fell sometimes into his own demons from inside.