ROS are implicated in the pathogenesis of several diseases. In cancer, for example, ROS can induce mutations and promote tumor progression. In cardiovascular diseases, oxidative stress contributes to atherosclerosis by damaging endothelial cells and promoting inflammation. In neurodegenerative diseases like Alzheimer's, excessive ROS can lead to neuronal damage and cognitive decline. Understanding the role of ROS in these conditions is critical for developing targeted therapies.