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In the last decade, numerous scientific evidence suggested possible adverse health effects from exposure to electromagnetic fields (EMF'S) and the use of mobile phones. According to some studies EMF induced changes of trans-membrane Ca ++  flux may lead to altered metabolism and/or secretion of neurohormones including TSH, ACTH, GH, prolactin and melatonin. The aim of this research was to analyse the effects of mobile phone use on thyroid function and to evaluate the possible role of occupational stress. 2598 employees (1355 men and 1243 women) with different duties (vendors, operators and network technicians) were included in the study. Exposure to EMF'S, generated by mobile phones, was assessed both by submitting a questionnaire directly to the employees and acquiring data regarding conversation times. The workers were divided into three groups on the basis of their personal mobile phone use. Moreover, a group of 160 workers with TSH values below 0.4 UI/1 was characterized. No statistically significant difference regarding TSH values below 0.4 UI/1 was observed among workers with different duties but there was a greater prevalence of subjects with low TSH values among 192 employees with more than 33hrs./month conversation time; this difference was statistically significant (p&lt;0.05). On the basis of our data, it is not possible to establish whether this result is determined by exposure to EMF'S from mobile phones or by the stress of using these instruments.

Are Thyroid Dysfunctions Related to Stress or Microwave Exposure (900 Mhz)?