Study aim: To determine the Effectiveness of Multi Disciplinary Interventions Based on Health Belief Model on Musculoskeletal Pain in the Elderly living in Nursing Homes Design: A randomized controlled clinical trial. From each district of Tehran, two nursing homes, one for the control group and the other for the intervention group, are selected by lottery (60 people in the intervention group, 60 people in the control group). Settings and conduct: The intervention is carried out on the elderly living in a nursing home in Tehran in the form of cluster sampling. Trainings are conducted by the training team on the intervention group. The researcher-made questionnaire is used for this study. Finally, after collecting the data, two intervention and control groups are compared. Participants/Inclusion and exclusion criteria: Inclusion criteria: people aged 60 and older living in a nursing home ability to do physical activity، ability to answer questions. Exclusion criteria: elderly with Alzheimer's disease، elderly with mobility disabilities, and elderly who use medication to control pain. Intervention groups: This six-month educational intervention includes three parts of physiotherapy, stress reduction and vitamin D intake, including: walking by the elderly and maintaining the correct body posture (correct exercises for standing, walking, etc which reduce the pressure on the muscles and thus reduce pain during daily activities ), the benefits and The way to take vitamin D is by a doctor and to take 50,000 units of vitamin D tablets monthly and to control stress. According to the opinion of the physiotherapist and psychologist, 4 to 6 six sessions per month (one 45-minute session each week) are held. Control group: will not receive the educational intervention, and the follow-up of this group will be to complete the questionnaire in specific time intervals. Main outcome variables: Musculoskeletal pains