Breast cancer is the most common malignancy and cause of cancer-related death in women globally. Early detection is vital for improving survival and treatment options. This study compares the effectiveness of mammography and sonography in detecting breast cancer. Women are advised to begin annual mammograms at age 40, unless there is a family history of breast cancer. Sonography is often used when mammograms show abnormalities, women with dense breast tissue, during pregnancy, or when a palpable mass is detected. While mammography is widely used, it may not always be available or feasible in some settings. Sonography, alone or combined with mammography, can also be effective. Studies show that depending on factors like age, breast density, and family history, sonography may have higher sensitivity than mammography. The combination of methods offers superior diagnostic accuracy, suggesting that integrating sonography with mammography could enhance breast cancer detection, especially in patients with dense tissue.