This study was conducted to examine how the internal migration from East- to West Germany has developed over 30 years, from 1990 to 2020. The purpose of this study is to examine the motives for the migration decisions of East Germans, as well as examine the consequences of East-West-Migration in Germany. This is a litterature study and the theories that have been used are different migration theories, where the focus lays on the economic theories. The conclusion of this study is that internal migration in Germany has had different waves and shapes, and the scale of internal migration depends on which period it is about. Reasons for relocation are individual, but gender and age have played an important role for the migration decision. The consequences of internal migration in Germany are the loss of human capital of qualified people in East Germany, as well as change in the population structure.