Simple Summary: Prostate cancer (PCa) is a major health issue among men, with risk factors such as age, family history, genetics, and race being well known. However, the impact of lifestyle choices has often been overlooked. This study aimed to understand health professionals' perceptions of PCa risk factors to design a questionnaire applicable to the male population. Three focus groups were conducted to discuss topics, such as the impact of diet, physical activity, alcohol consumption, smoking, sexual health, and screening and treatment methods. Although healthy lifestyles can generally improve PCa outcomes, no specific lifestyle change has been identified as a preventive measure, particularly for older adults. Lycopene, present in tomatoes, was highlighted for its antioxidant benefits. This study demonstrates the necessity for additional research on how lifestyle affects PCa and emphasizes the importance of health professionals in encouraging the adoption of healthier habits. It also suggests exploring non-invasive screening through urine and innovative treatment methods to reduce false positives and side effects, respectively. Prostate cancer (PCa) accounts for 20% of new cancer cases and 10.5% of cancer-associated mortality in Portugal. Associated risk factors include advanced age, family history, genetic alterations, and race/ethnicity. However, the role of lifestyle factors is often underestimated. To explore health professionals' perceptions of PCa risk factors, a qualitative study with three focus groups (FG), with a total of twenty-one general practitioners and urologists, was conducted via videoconference between February and April 2023. Seven themes emerged, including general perceptions of PCa; PCa risk factors; nutritional impact; the role of physical activity; alcohol consumption and smoking; sexual activity and sexually transmitted diseases roles in PCa; and screening, diagnosis, and treatment methods. Despite agreeing that healthy lifestyles could promote better PCa outcomes and quality of life, participants did not specify any lifestyle factors that could promote or prevent this disease, posing challenges to lifestyle changes, particularly among older adults. Non-invasive screening methods, such as biomarkers and alternative treatments, are crucial for future research. This study underscores the need for further investigation into the correlation of lifestyle factors with PCa and highlights the necessity of health professionals in encouraging their patients to adopt healthier lifestyles, while offering important insights into awareness, prevention, and alternative screening, diagnosis, and treatment methods, which could help reduce false positives and treatment side effects.