The development of nanomaterial-based biosensors represents a significant advancement in the early detection of diseases, offering remarkable sensitivity and specificity. This paper explores the creation and refinement of biosensors that utilize various nanomaterials, such as nanoparticles and graphene, to identify disease biomarkers at early stages. We focus on the synthesis and functionalization of these nanomaterials to enhance biocompatibility and target accuracy, integrating them into sensor platforms to improve signal detection. Through advanced fabrication and surface engineering techniques, we achieve enhanced interaction between nanomaterials and bio- logical molecules, leading to lower detection limits. We also examine how design parameters, such as transducer types and signal processing methods, can be optimized for greater sensitivity and reliability. Case studies highlight the application of these biosensors in detecting diseases like cancer and infectious conditions, underscoring their potential to revolutionize early diagnostics with rapid, precise, and non- invasive approaches. This innovation holds promise for advancing personalized medicine and improving public health outcomes.