Background More than 1,750 Nepalis leave the country daily for foreign employment. A total of 6 39 167 aspirant migrant workers left for various countries in last fiscal year 2016/17, up from418,713 in previous FY 2015/16. Most the migrant worker destination is hot humid climate countries for occupational work especially chemical, biological hazards.

Methods It is the retrospective study among return migrant male 100 case reports with non-migrant control reports in (2016 Jan–2018 Nov.) years. Data of Semen analysis reports(questionnaire for duration of infertility, sperm count, percentage of normal sperm morphology,percentages of sperm ), BMI, mini mental health examination and family details data was collected. Descriptive statistics, analysis of variance, and correlations were conducted using SPSS 21.0 and Epi info

Results Most of the return migrant workers who had long term (>1 years) exposed with solvents, biological or chemical occupation have less than the normal sperm counts than non-migrant cases. BMI was normal but the mental stress on return migrant workers having more than others. Clinical findings of less than 20 million/mL sperm concentration, progressive motility 32%, Odds ratios (ORs), after allowing for confounding, were 2.07 (95% confidence interval (95% CI) 1.24 to 3.44) for 1–3 years exposure to solvents and 3.83 (95% CI 1.37 to 10.65) for more than 3 years exposure. Chances of fertilization was at least 1–2 year among long term migrant return workers.

Conclusion Occupational hazards in reproductive life is more seen among the mental stress workers. It may be due to improper use occupational safety clothes, equipment etc. Proper counselling, Workplace safety rules and regulation policy should be clearly documentation for all migrant workers. Occupation physician screen all workers health every 3 months. Education, awareness and changing attitude of work style is essential in this globalization era.