On average, approximately 80,000 young adults (YAs) aged 18 to 39 are diagnosed with cancer each year in the USA, accounting for approximately 5% of all cancer diagnoses. YAs experience difficulties in dealing with the physical and psychological changes associated with cancer and its treatments, the management of acute and ongoing symptoms, and worrying about progression or recurrence. In addition, YAs are also engaging in normal developmental processes across various social, emotional, and financial domains. When diagnosed with cancer, these developmental processes are disrupted, resulting in elevated psychological and psychosocial distress. Although the reported quality and severity of these impacts are largely qualitative in nature, some reports indicate that YAs diagnosed with cancer are 57% more likely to develop depression and 29% more likely to develop anxiety than YAs without cancer and are more likely to have clinically significant levels of psychological distress compared to pediatric and older adults with cancer. To ensure the needs of this population are being met, it is important that supportive interventions for YAs with cancer are acceptable and age appropriate.

Spirituality refers to an individual's search for meaning in life and personal connectedness with the divine and transcendence beyond self, other individuals, and the environment and is recognized as an essential element of person-centered care. During developmental years, it is natural for YAs to explore spirituality to inform decisions, self-understanding, and meaning-making processes, and recent survey data from a nationally representative sample indicates that \>50% of YAs report spirituality as important to them. Research has revealed that higher levels of spirituality predict better health-related quality of life in patients with cancer, even after accounting for physical and emotional wellbeing, and better patient reported mental health. However, there has been limited research exploring the unique spiritual perspectives of YAs resulting in insufficient guidance on how to best support them within this domain. Given the potential for spirituality to improve mental and physical health and to help reduce the psychosocial burden of a cancer diagnosis, research exploring spiritual self-care interventions in YAs with cancer is warranted.

Cancer patients report that they receive less spiritual care than desired from their healthcare providers. Research exploring barriers to delivering spiritual care at the bedside include time constraints, lack of confidence in effectiveness, and role uncertainty. When it comes to accessing spiritual care that is available, there are additional barriers for patients including: 1) requiring personal resources to access (e.g., transportation, time, insurance), or 2) limited options for remote, on-demand interventions despite preferences for them. Overall, there is a need and demand for accessible spiritual self-care for YAs, and addressing this gap could result in additional positive impacts on several aspects of physical and psychosocial wellbeing.

Digital health tools (e.g., smartphone apps) provide an opportunity to overcome barriers relevant to YAs with cancer including geographic mobility, time constraints, competing priorities, and limited psychosocial support providers. Furthermore, as 'digital natives', YAs are already high utilizers of technology, reducing the barrier of digital literacy in the uptake of such tools. Given the increasing focus on providing personalized, inclusive, and accessible care, leveraging digital health tools such as mobile apps may help fill the gap in addressing the unique spiritual needs of YAs with cancer and provide opportunities for efficacious, scalable interventions to increase access and reach to YAs who are most in need. Currently, research on interventions (digital or otherwise) to support spiritual wellbeing in YAs with cancer is exceedingly rare. This feasibility work will be a first step in testing whether a spiritual self-care mobile app can be used to support spiritual wellbeing in YAs with cancer.