I m looking for studies that can explain how can patients and health individuals perceive about a particular disease. The method I want to use is Qualitative.
I would like to agree with you about the use of a qualitative study in this case. To measure perception of a disease, you would need a validated questionnaire or modified form of it. In the absence of a validated questionnaire which would be rare, you may have to prepare a questionnaire and validate it. However, which disease are you interested in?
Qualitative methods are used to answer questions about experience, meaning and perspective, most often from the standpoint of the participant.For example:
Levkovich, I., Cohen, M., & Karkabi, K. (2019). The Experience of Fatigue in Breast Cancer Patients 1–12 Month Post-Chemotherapy: A Qualitative Study. Behavioral Medicine, 45(1), 7-18.
Wi studied perceptions of problematic events in care of leukemia and in another paper attitudes about mental health, in the second we used both qualitative and quantitative measures: