One literary style in "The Yellow Wallpaper" is the epistolary story. Written as the short diary of an unnamed woman, it can be seen as a recovered document, never meant for public eyes, or as a direct plea for help aimed at anyone who is willing to listen. Since it is written by only one narrator, it is a monologic epistolary story.
An epistolary story aims to feel more realistic and possible than a typical story. By allowing the reader into the private mind of the writer, directly seeing and understanding her innermost thoughts, "The Yellow Wallpaper" is able to show the slow deterioration of the narrator's mind with her own words, even if she doesn't directly realize it. Her story breaks off when her husband approaches, and does not include every little event, but only what is on her mind at the moment; in this fashion, the reader is given access to a "secret" account, something that her husband never sees.