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Background:Breast reconstruction is an effective technique to rebuild the appearance of the breasts in patients after mastectomy and improves the prognosis.The current study aimed to compare and analyze willingness for breast reconstruction after breast cancer between populations in China and the United States,from the perspective of social concern,using big data analysis.We also aimed to explore factors affecting surgical selection and to identify methods that can improve social cognition and acceptance of breast reconstruction.Methods:Using Baidu and Google,two representative Intemet search engines in China and the United States as research tools,and using big data search volume as the benchmark,we compared and analyzed breast recon-struction willingness and attention characteristics between Chinese and American people,based on search heat,geographical distribution,age and sex,keyword distribution,ethnic group,and social development degree.Results:In both the long-term and short-term,Chinese people paid more attention towards searching about breast cancer,but less attention to breast reconstruction after breast cancer surgery.However,in both the short-term and long-term,people from the United States paid more attention towards breast cancer and breast reconstruction with the help of the Internet,showing a synchronous change relationship.There was a large regional difference in the search volume for breast cancer among the Chinese population,while no significant regional differences were noted in the search volume for breast cancer in the United States.However,a large regional difference was observed in the search volume for breast reconstruction between the two countries;people in the coastal and economically developed areas paid more attention to it.Most people who paid attention to breast reconstruction in China were women aged 20-39 years,while the attention among men was low.Search keywords were also limited to breast cancer-related information.However,between Asians and European Americans,Americans paid more attention to breast cancer and were affected by regional development,religious beliefs,and health facilities.Conclusion.:Attention towards breast reconstruction after breast cancer was lower in the Chinese population than in the American population,and this difference was closely related to the level of regional development.There is insufficient information on breast reconstruction after breast cancer in recent Internet media.In addition to strengthening communication in clinics,media education is important to improve the cognitive level and social awareness of patients and their families,which is conducive to breast reconstruction.