The effect of gratitude intervention based on broaden-and-build theory on social isolation in young and middle-aged lymphoma patients during chemotherapy

INTERVENTION: Intervention group:4‐week gratitude intervention based on the broaden‐and‐build theory: Week 1: Cognitive restructuring and emotion recognition; Week 2: Gratitude cultivation and meditation (gratitude videos + daily gratitude journaling); Week 3: Gratitude expression and sharing; Week 4: Review and consolidation. ; Control group:Routine health education; CONDITION: Lymphoma PRIMARY OUTCOME: ocial isolation level of young and middle‐aged lymphoma patients;Gratitude status of young and middle‐aged lymphoma patients; SECONDARY OUTCOME: Depression and anxiety levels of young and middle‐aged lymphoma patients;Social support level of young and middle‐aged lymphoma patients; INCLUSION CRITERIA: 1. Patients with lymphoma confirmed by pathological examination and bone marrow aspiration report according to the CSCO guidelines. 2. Patients who have received at least 2 cycles of chemotherapy (21‐day cycle). 3. Patients with effective communication and understanding ability. 4. Age 18‐60 years old. 5. Patients able to complete questionnaires independently. 6. Patients consenting to participate. 7. Patients with GSA score >=30 (significant social isolation).