This study aims to describe a participatory process by investigating the perceptions and expectations of people with multiple sclerosis (pwMS) toward the scientific writing (SW) process and the role of patient engagement and quality of life in influencing them. A two-phase, multi-methods study was conducted inspired by the MULTI-ACT model. Four co-creation workshops were organized, and the results were used to design a survey, which was translated into eight languages and distributed internationally to 1120 patients. The results from the workshops and the survey were collaboratively used to develop a model for engaging patients in SW. Participants expressed a willingness to share their unique experiences of the disease, contribute ideas and words to the project, and engage in research-related problem-solving. The main barriers to patient engagement in SW were identified as physical, psychological, and technical. The survey sample consisted of pwMS primarily from Italy (28.5%), was predominantly female (73.7%), with a mean age of 50.3 years and an average MS diagnosis duration of 13.5 years. Among the participants, 45% had never participated in research initiatives, 89% had never been an author of a scientific publication, and 51% expressed interest in future participation. Patients’ disease awareness and their perception of quality of life may influence their predisposition towards research and SW. Patient co-authors clearly articulated their perspectives on the essential factors required for contributing to the publication process. A more sensitive approach should be adopted in order to take into account the psychosocial conditions of people with multiple sclerosis and what may hinder their participation in research and in writing scientific publications in order to really guarantee equal access to all. Scientists are increasingly recognizing the value that people with lived experience of an illness bring to medical research, including their contributions to planning, managing, and authoring scientific publications. This study involved patients and researchers in a participatory process to highlight the benefits of patient participation in research. A global survey completed by over 1,000 people with Multiple Sclerosis (MS) from diverse backgrounds aimed to understand their engagement in research and the factors influencing their participation. The study revealed several barriers that prevent people with progressive MS from fully engaging in the research process. Many participants cited severe fatigue, limited energy, physical isolation, and poor mental health as major obstacles. Perceived quality of life significantly impacted their interest and willingness to participate in research and their confidence in contributing to scientific authorship. Additionally, systemic barriers discouraged patient engagement in research and scientific writing: the need for fluency in English, challenges arising from cultural diversity, lack of confidence in using scientific terminology, and the rigid formats of traditional research and publishing. Poor communication between scientists and patients and a perceived lack of inclusivity also hindered participation. To address these issues, the paper advocates for several measures to promote inclusivity by setting clear communication goals, providing support to overcome language barriers, and creating a support network to address individual patient needs. Institutional, funding, regulatory, and publishing formats should become more flexible and collaborative. Systemic changes are needed to make patient engagement meaningful, accessible, and effective, fostering a respectful two-way dialogue between scientists and patients.