The authors report their experience with thyroid disorders. Between January 1994 and December 2003, a total of 567 patients (sex ratio: 1/20, men to women) with thyroid disease were examined in the endocrine and metabolic department of the Brazzaville Teaching Hospital. Their mean age was 43 years. 333 (58.7%) had a simple goiter, 118 (20.8%) hyperthyroidism, most often related to Graves' disease (60.8%). Other disorders included multinodular goiters (19.2%), toxic adenoma (7.1%) and thyroiditis (13.8%). Hypothyroidism was identified in 7.4% of cases, mainly following thyroid surgery. Thyroid cancer was rare (4 cases).