The psychological component of the therapeutic effect of any therapy, from pharmacotherapy to physiotherapy, known as & # 96; placebo effect, is determined by the influence on the patient of numerous influences: doctor, staff, acquaintances, advertising, fashion, rumors, prejudices and other factors, his attitude to treatment, to himself, to illness, to the doctor. This monograph, written on the basis of many years of experience of the author in studies of the placebo effect in healthy people and patients.