There are a number of theories that explain how EMDR works.  These include the following:

1. Desensitisation and Reprocessing: EMDR appears to help the brain reprocess traumatic memories in a way that makes them less disturbing. This is thought to be achieved by connecting the traumatic memory with more adaptive, healthier information, thereby reducing its negative emotional charge.
2. Bilateral Stimulation: The bilateral stimulation used in EMDR (e.g., eye movements) is believed to facilitate the brain’s information processing system. This stimulation may help desensitise the memory, making it less intense, and allowing the brain to process it more effectively.
3. Working Memory Theory: Some researchers suggest that EMDR works because the bilateral stimulation taxes the brain’s working memory. By simultaneously focusing on the memory and performing the bilateral stimulation, the emotional impact of the memory is reduced.
4. Neurobiological Effects: There is also evidence to suggest that EMDR may help alter the way the brain stores traumatic memories, potentially shifting them from short-term, emotionally charged storage to long-term, narrative-based storage, where they can be accessed without triggering intense emotional responses.

There is lots of additional information about EMDR available online - a good source of information is https://www.brainpost.co/weekly-brainpost/2022/2/15/emdr-therapy-whats-happening-in-the-brain

If you are interested in finding out whether EMDR could be helpful for you, please get in contact.