According to Psychology Today:
Bibliotherapy is a therapeutic approach employing books and other forms of literature, typically alongside more traditional therapy modalities, to support a patient’s mental health. Though the books recommended by therapists can encompass any genre or theme—from philosophy to memoir to self-help—bibliotherapists typically make use of fiction.
Reading specific pieces of literature and talking about them with a therapist (or in a group therapy setting) is thought to help patients understand perspectives other than their own, make sense of a difficult past or upsetting symptoms, or experience feelings of hope, contentment, and empathy. More generally, reading is also thought to improve self-esteem, self-awareness, and feelings of self-efficacy.
https://www.psychologytoday.com/us/therapy-types/bibliotherapy
