2. The rapid course of the disease.
Not attaching enough importance at the early stage, the surrounding people, as well as the patient, are vulnerable to the second stage of the disease, which can occur with lightning speed: significant memory loss, violation of motor function, inability to take care of themselves, unmotivated anger, speech disorders, worsening of ability to control his own body, apathy.
If at the early stages the patient still can do the necessary types of activity, then as the disease progresses, the patient becomes more and more helpless and eventually completely loses the ability to control the physiological functions of the body, loses the ability to perceive the world around us, to orient himself in space and in time, recognize loved ones, talk, eat, move independently.
This disease gained the status of "incurable" due to a great extent of the previous factors and the helplessness of medicine at the moment. Drugs available at the moment, can only slow down the manifestation of symptoms, but still this achievement is important because, at least, adds a few years of real life, not existence.
The causes of this disease have not yet been established.