<p>Heavy metal toxicity poses a significant global health challenge, with profound impacts on physiological, immunological, and cellular functions. This review delves into the oxidative-inflammo mechanism, a key pathway driving toxicity from metals such as lead, mercury, cadmium, and arsenic. The oxidative-inflammo response stems from the interplay between oxidative stress and inflammation, forming a self-perpetuating cycle of damage. Heavy metals induce the overproduction of reactive oxygen species (ROS) and reactive nitrogen species (RNS), which overwhelm antioxidant defenses, resulting in lipid peroxidation, protein denaturation, and DNA damage. This disruption of cellular homeostasis activates inflammatory pathways, including the NLRP3 inflammasome and redox-sensitive transcription factors like NF-κB, leading to the release of pro-inflammatory cytokines such as TNF-α and IL-6. These mediators amplify ROS generation and exacerbate tissue injury. The bi-directional relationship between oxidative stress and inflammation is a hallmark of heavy metal toxicity, promoting chronic cellular dysfunction and contributing to degenerative conditions such as carcinogenesis, neurodegeneration, and cardiovascular diseases. Furthermore, metal-induced epigenetic alterations, including DNA methylation and histone modifications, compound these effects by silencing tumor suppressor genes and disrupting normal gene expression, thereby facilitating disease progression. This review highlights the intricate mechanisms underlying the oxidative-inflammo response to heavy metals, emphasizing the need for targeted interventions such as chelation therapy, antioxidant supplementation, and public health measures to mitigate the adverse health impacts of metal exposure.</p>