A personal experience about 135 pz. with non-toxic goitre treated by mono o bilateral thyroidectomy and followed during 5 years (2-8) to evaluate the incidence of recurrences is reported. The recurrences were 10.5%, especially after monolateral thyroidectomy (9 pz.). Therefore the authors stress the importance of a more accurate surgical indication, a wider resection of the gland and a careful follow-up to undertake opotherapy when hypofunction appears.