Environmental migration in coastal areas is increasingly shaped by the interaction between environmental stress and livelihood insecurity. This study examines how repeated environmental disasters contribute to environmental migration in the Indian Sundarbans, with particular attention to livelihood loss, asset destruction, and declining capacity to recover in place. A qualitative research design was adopted, based on ten Focus Group Discussions conducted across ten villages in five administrative blocks, involving 60 participants who had experience of migration. The findings show that repeated environmental disturbances, including cyclones, riverbank erosion, and sea-level-related changes, affect agricultural land, fisheries, freshwater resources, housing, and other livelihood assets. These repeated losses progressively reduce household livelihood security and make recovery from subsequent environmental shocks more difficult. Migration emerges through this cumulative process, particularly when traditional livelihood activities and local employment opportunities become insufficient to sustain households. The findings further indicate that environmental migration is not a uniform or entirely voluntary response, but may range from temporary movement to longer-term livelihood-driven migration as households' ability to adapt and remain in place becomes increasingly constrained. The study highlights the importance of understanding environmental migration in coastal areas through the interconnected processes of repeated environmental stress, livelihood vulnerability, and declining adaptive capacity.