Diabetic foot ulcers (DFUs) are serious complications of diabetes, characterized by chronic wounds that do not heal due to peripheral neuropathy, ischemia, and prolonged hyperglycemia. These ulcers greatly diminish the quality of life and lead to high lower-limb amputation rates and healthcare costs. The pathogenesis of diabetic foot ulcers involves systemic metabolic imbalance with local immune abnormalities contributing to impaired healing. Chronic inflammation, reduced growth factors, impaired angiogenesis, and extracellular matrix (ECM) remodeling defects lead to nonhealing DFUs. Immune dysregulation by hyperglycemia increases inflammation, exacerbated by impaired macrophage polarization and neutrophil function. States of oxidative stress lead to decreased endothelial function, whereas ECM degradation due to imbalances in matrix metalloproteinases impedes the formation and structural integrity of granulation tissue. DFUs frequently get infected with treatment, which gets complicated by biofilm formation containing pathogenic bacteria. This chapter discusses the complex interplay of inflammation, innate immune responses, and fibrosis in DFUs, highlighting the need for new drugs to tackle this health problem. A comprehension of molecular mechanisms that underlie the pathogenesis of DFU will help in creating interventions that are specific to enhance results for patients and eliminate the socioeconomic burden associated with complications from diabetes. Proper knowledge and comprehension of these mechanisms are essential for the development of targeted therapeutics and effective treatment options.