[Summary of the practice guideline 'Thyroid disorders' (first revision) from the Dutch College of General Practitioners].

--The practice guideline 'Thyroid disorders' developed by the Dutch College of General Practitioners replaces the practice guideline 'Functional thyroid disorders' from 1996. Recommendations for palpable thyroid disorders have been added. --Hypothyroidism can often be treated by the general practitioner. The guideline offers specific recommendations for substitution therapy based on the 'start low, go slow'-principle. --Pharmacological treatment of hyperthyroidism is described as an optional activity for general practitioners. --A conservative approach is taken to the treatment of subclinical thyroid dysfunction. The development of symptoms may justify treatment initiation. --Cooperation has improved harmonisation of this practice guideline with the Netherlands Association for Internal Medicine's practice guideline 'Functional thyroid disorders' and the Dutch Institute for Healthcare Improvement's practice guideline 'Thyroid carcinomas'.