One of the most important research and evaluation tools for understanding the relationship between psychological and behavioral factors and their impact on physical health. These tools allow researchers and clinicians to measure emotions, anxiety and depression, stress levels, coping strategies, and personality traits, as well as correlate them with physical and physiological indicators such as blood pressure, heart rate, hormone concentration, and immune system activity. The development of accurate and reliable questionnaires makes it possible to collect quantitative and qualitative data that make it possible to analyze psychological patterns in individuals and groups and to determine the degree of influence of these factors on the occurrence or exacerbation of psychosomatic symptoms. Psychological scales also help assess the effectiveness of various therapeutic interventions – cognitive-behavioral psychotherapy, relaxation programs or social support – by comparing the results before and after the intervention. The use of questionnaires and scales in psychosomatics is characterized by the possibility of providing objective indicators that can be measured and statistically analyzed. This contributes to the construction of accurate scientific models linking mental health to physical well-being. The use of questionnaires also expands the ability of researchers to interpret the interaction of mind and body in various clinical and natural settings. Thus, this use of questionnaires represents an essential tool for understanding psychosomatic phenomena and for developing diagnostic, therapeutic and preventive programs based on scientific evidence.