| Clinical signs | Number of patients (n = 878) | Percentage |
| Palpitation | 730 | 83.1% |
| Weight loss | 702 | 79.9% |
| Trembling | 610 | 69.4% |
| Insomnia | 447 | 56.7% |
| Thermophobia | 486 | 55.3% |
| Asthenia | 471 | 53.6% |
| Excessive perspiration | 440 | 50.1% |
| Irritability and nervousness | 417 | 4.4% |
| Sign of weakening of muscles | 255 | 29% |
| Diarrhoea | 209 | 23.8% |
| Polyuria and polydipsia | 172 | 19.5% |
| Genito-sexual disorders | 121 | 1.3% |