There are many explanations for "flying over Hengyang", including the meaning of "lovesickness". In poetry, "flying geese over Hengyang" is often used to describe the feeling of missing. Its specific meaning depends on the specific situation, and it can express different feelings such as sadness, parting, missing and distance.
Hengyang was one of the important cities in the south in ancient times and an important hub of north-south transportation. Every spring and autumn, migratory birds will migrate from south to north or from north to south, passing through Hengyang area. Therefore, "flying geese over Hengyang" has also become a form of expression for ancient poets to express their feelings of parting.