A 52-year-old woman presents to the clinic for her annual health check-up. She has no significant complaints but mentions a family history of breast cancer (mother diagnosed at age 55). She is postmenopausal, has a BMI of 28 kg/m², and leads a sedentary lifestyle. She has mild hypertension (BP: 145/90 mmHg) but has not been consistent with follow-ups or regular health screenings. During the visit, the physician emphasizes the importance of secondary prevention in her healthcare plan. What is the primary goal of secondary prevention in healthcare?