Epileptic patients who, after years of being free from symptoms, have relapses during puberty or adolescence (some-times coinciding with a reduction in therapy) pose special therapeutic and diagnostic problems. Because of pubertal lability, the cause of a relapse might seem to be "organic", especially if the EEG also shows a "deterioration", yet psychogenic factors must not be disregarded. On the basis of typical case studies, a characteristic constellation is presented. The achievement of a "well-behaved" child at first dramatically improves and this correlates with the success of antiepileptic therapy. Then individuation and further development cannot adequately take place because the family unit is not functioning properly. At a critical stage of development, the excessive expectations of the parents lead to too much stress on the child, thus destroying the balance within the family system, which has hitherto been maintained only with difficulty. Attempts to improve the situation by changing the medication (increasing the dose or switching to another drug) fail. If, however, it is realized that the symptoms are of psychogenic origin, adequate therapeutic interventions (e.g. adequate schooling or professional training as well as psychotherapy) promise good results.