Background: Regarding the process of transsexuality as a topic in the domain of sex study is not well-cared so far in different cultures. The present research aims to investigate the social causes expending the tendency sex change surgery among transsexual youth in province Tehran.

 Methods: Descriptive and survey methods were used to analyze data collected through questionnaires. The population included 312 transsexuals referring to Welfare Organization of Tehran. A sample of 150 cases was selected through Cochrane's sampling formula. Independent variables included culture, socio-economic status, religious values, civil-jurisprudence knowledge, and political sway. Sexual change (from male to female and vice versa) was regarded as the dependent variable. Results analyzed through the use of statistical tests and software SPSS.

 Findings: Regarding the correlation coefficient obtained, the findings show that there is a significant relationship between, 1. Parental absence (female to male: 0.61) (male to female: 76), 2. Family support (female to male: 0.43) (male to female: 0.53), 3. Family satisfaction (female to male: 0.37) (male to female: 0.31), 4. Life expectancy (male to female: 0.64 ((female to male: 0.53), 5. Labeling (female to male: 0.69) (male to female: 0.73)  6. Adherence to traditional values (female to male: 0.59) (male to female: 0.70) 7. Employment (female to male: 0.59) (male to female: 0.63), 8. Income (female to male: 0.89) (male to female: 0.91), 9. Education (female to male: 0.67) (male to female: 0.55), 10. Adherence to religious beliefs and values (female to male: 0.73) (male to female: 0.66), 11. Non-existence of legal laws and acts (female to male: 0.39) (male to female: 0.26), 12. Performance of governmental organizations on one hand and tendency to sexual change on the other hand (female to male: 0.39) (male to female: 0.33). 

 Conclusion: The present study confirms that the most effective and important cause tendency in expenditing sex change surgery was include income level, the absence of either per both parents, stigmatizing and adherence to religious beliefs minimum cause was family satisfaction that:

 1- with financial support and public insurance and development of special hospitals

 2- by giving information to families,

 3- for acceptance by the society, Can to help them (some of people with gender identity disorder)