Subacute thyroiditis is often unrecognized and patients may be treated for pharyngitis, laryngitis, otitis media or similar disorders connected with otolaryngology. It is conceivable that these patients may seek treatment in ENT departments. The difficulties encountered in making a correct diagnosis are illustrated here on the basis of 12 consecutive cases. Eight of these patients were initially misdiagnosed resulting in useless therapy. Sub acute thyroiditis is a self-limiting illness, and permanent myxoedema is rare. Nevertheless, one case with this sequela is reported.