Well-being in IBS: Strengths and Happiness (WISH) 2.0

Inclusion Criteria:

* IBS Diagnosis: Adult patients with an IBS diagnosis meeting standardized Rome IV diagnostic criteria.
* Language and communication: English fluency and access to a phone.

Exclusion Criteria:

* Presence of inflammatory bowel disease or other structural/biochemical primary gastrointestinal illness that better explains IBS-like symptoms: As reported by the patient, their physician, and/or documented in the medical record.
* Severe psychiatric illness: Current manic episode, psychosis, or active substance use disorder diagnosed via the Mini International Neuropsychiatric Interview (MINI) or Diagnostic Interview for Anxiety, Mood, and OCD and Related Neuropsychiatric Disorders (DIAMOND).
* Cognitive impairment: Assessed using a six-item cognitive screen developed for research.
* Presence of atrial fibrillation or a cardiac pacemaker, or daily use of beta blocking medication: As reported by the patient and/or documented in the medical record.
* Plans to start or participate in another new behavioral health intervention or psychotherapy during the study period.