The author emphasizes the difficulty of the subject since on the one hand there is no assurance about the value of the treatment methods performed commonly at the moment, and on the other hand there is an evident lack of prospectively controlled trials and double-blind studies. Mostly this dilemma occurs by the lack at the moment of any specific treatment. The author deals with the four therapeutic methods most commonly used: colinerglc drugs, thymectomy, immunosuppressive drugs and plasmapheresis. At last, the experimental specific immunotherapy by the use of antibodies and suppressive cells and the irradiation methods are discussed.