IRCT20180714040458N2 IRCT 2020-09-22 Islamic Azad University The effect of laughter therapy on chemotherapy-induced nausea and vomiting The effect of laughter therapy on nausea and vomiting in patients undergoing chemotherapy for cancer 2019-05-22 anticipated 80 Complete https://irct.ir/trial/51011 interventional Randomization: Not randomized, Blinding: Triple blinded, Placebo: Not used, Assignment: Parallel, Purpose: Supportive, Blinding description: In the present study, participating patients, clinical caregivers (nurses), and data analysts were kept blind in the study. None of the participants know which intervention or control group they belong to and only know that they are participating in the research. Also, the nurses who are responsible for caring for the patients under study do not know the type of intervention or patient control group. Finally, the data analyzer will not know the type of patient group and the data will be provided as a code. N/A nausea and vomiting. Intervention 1: Intervention group: This group undergoes laughter therapy for 30 minutes 3 times a week for 3 weeks. Laughter therapy includes 10 minutes of funny short films, 5 minutes of jokes and finally 15 minutes of live funny programs by a small group of theaters approved by the Ministry of Culture and Guidance. Intervention 2: Control group: Control group: This group will not receive any intervention other than routine care. No - There is not a plan to make this available Justification or reason for not sharing IPD is The data is kept confidential by the researcher and provided to the study participants if desired. Data analysis is presented in the form of tables and charts..