Introduction: The number of refugees has increased in recent years in Europe and mainly in countries such as Germany, Sweden and Norway. Sweden received 54605 refugees in 2016 and 2017. It also has been reported that refugees flying in to European countries have an increased symptoms of psychological disease. Purpose: The purpose of the literature study is to demonstrate different factors that are important in a migration process in western countries.There may be a connection with refugees who flee to and live in European countries that they may run an increased risk of psychological disease. Method: To obtain an overall picture of various factors for psychological symptoms in adult refugees living in western countries based on a literature review. Results: The result identifies four factors for psychological disease mental illness among refugees who move to Western countries. It can be deduced that factors such as trauma experiences, social capital and access to hospital care, language and culture have an influence on the individual's psychological attitude.