There is clinical evidence for the efficacy of expressive writing as a mental health intervention. James Pennebaker's decades of research show that writing about emotionally significant experiences improves both psychological and physical health outcomes.
The mechanism appears to be the act of sense-making — transforming experience into narrative creates distance from the raw emotion and activates the prefrontal cortex, which is involved in emotional regulation.
You don't need to write beautifully. You don't need to write for an audience. You need only to write honestly — about what you felt, what you thought, what you were afraid of.
The page does not judge. The page simply holds.
Even five minutes a day, consistently, can begin to shift your relationship with your own inner life.