Despite the success illness novels have acquired in the last decade, the misrepresentation of chronic illness in the Young Adult genre is still going unnoticed. In an ableist society that still needs to be educated about invisible disabilities, most of the contemporary YA writers insist on finding miraculous solutions and questionable happy endings to their stories. The aim of this thesis is therefore to study the different ways in which YA writers fetishize and understate invisible disability and to find a way to subvert it. By focusing on the miracle cure trope and romanticization in the case of Nicola Yoon’s Everything Everything, it attempts to highlight the characteristics of low-quality disability fiction and demonstrate why and how the use of disability biases can affect negatively both disabled and nondisabled young readers. In addition, through the scrutiny of the author’s first YA novel, Nothing Wrong with Snails, it then illustrates how the in-depth analysis of past disability literature improved the author’s personal craft and enabled them to portray chronic illness and invisible disability avoiding stereotypes, biases, and tropes. In conclusion, it argues that writers ought to rely on disability studies in order to reach higher standards in the representation of invisible disability in YA fiction.