[Difficulties in diagnosis of thyrotoxicosis in internal medicine]

Misdiagnosis of hyperthyroidism is explained first of all by errors in symptoms analysis, absence of ophthalmopathy, thyroid enlargement, predominant lesion of one system, atypical onset, various clinical masks (ischemic heart disease, active rheumatic fever with mitral and aortic defects, endogenic depression, obesity, gastrointestinal and hepatic diseases).