Thyroid disease affects at least 5 % of the general population. The incidence is higher in females and rises with increasing age. Thyroid disorders are most commonly of autoimmune origin or due to iodine deficiency or tumorous growth. Diagnosis involves 1) evaluation of the local findings, 2) evaluation of the thyroid function, 3) identification of the aetiology and biological nature. Diagnosis should be first established on the basis of the patienťs history and physical examination. TSH (Thyroid-stimulating hormone), fT4 (free thyroxin) and fT3 (free triiodthyronine) are the most important indicators of thyroid function. Ultrasonography provides substantial local anatomie information, thyroid autoantibodies (to thyroperoxidase, thyreoglobulin and the TSH receptor) are useful markers of autoimmunity. Fine-needle aspiration biopsy is the only reliable method to document malignancy. Thyroglobulin can be ušed as marker in the cancer treatment follow-up. The standard treatment procedures are well defined and have been proven in clinical practice, however due care must be given to the nature of the disease, the age of the patient, concomitant diseases and treatments. Treatment of thyroid disorders during pregnancy presents a speciál problém. The majority of thyroid diseases can be treated in the outpatient clinic. Cooperation between endocrinologist and generál practitioner is essential for the successful diagnosis and treatment of thyroid diseases.

        Key words: thyroid gland, diagnostics, therapy, hypothyroidism, thyrotoxicosis, goitre, thyroiditis.