A European-wide cross-sectional non-interventional study, initiated by a pilot study in Italy, will be conducted. The first phase of the pilot study is a 6-step translation, adaptation, and validation of the extended version of the Spiritual Needs Questionnaire (SpNQ-EV) and the Interpretation of Illness Questionnaire (IIQ) adopting the methodology [3] described in figure 1. To ensure they are both valid and user-friendly, the Thinking Out Loud (TOL) technique (think-aloud method) will pre-test their self-administration and provide fine tuning of the secondary objectives of the study. TOL involves participants verbalizing their thoughts while completing the questionnaires, allowing to capture real-time insights into their understanding, interpretation, and potential challenges with questionnaires' items. The second phase will consist of an anonymous e-survey consisting of the six questionnaires described in table 1 including the translated and validated SPNQ-EV and IIQ developed in phase 1. The European study will employ a multilingual anonymous e-survey developed to ensure accessibility in participants' native languages, eventually preceded by country-based pilot studies. Eligible participants include adolescents and adults with IBD, as well as their caregivers, recruited via nurses and patient associations.

Inclusion Criteria:

• adolescents and adults of all ages clinically diagnosed with CD, UC, or any other form of IBD (such as indeterminate colitis or IBD unclassified).

Adolescents and adults of all ages clinically diagnosed with CD, UC, or any other form of IBD (such as indeterminate colitis or IBD unclassified)