Early in his career, psychoanalyst Carl Jung expressed interest in abreaction, or what he referred to as "trauma theory", but later decided it had limitations concerning the treatment of neurosis. Jung stated that:
"though traumata of clearly aetiological significance were occasionally present, the majority of them appeared very improbable. Many traumata were so unimportant, even so normal, that they could be regarded at most as a pretext for the neurosis. But what especially aroused my criticism was the fact that not a few traumata were simply inventions of fantasy and had never happened at all".
Jung believed that the skill, devotion and self-confidence regarding the way the analyst did his work was much more important to the patient than the rehashing of old traumatic emotions.
The efficacy of this therapy has been likened to "lancing a boil". Exposing the wound releases the "poison" and allows the wound to heal. In the same way that the lancing process is painful, re-living the trauma can be highly distressing for the patient, and memories of the pain can be physically felt.