Restenosis is a common complication following vascular interventions such as angioplasty and stent placement. It involves the re-narrowing or reoccurrence of blockages in blood vessels that have previously been treated. Restenosis can occur due to a variety of factors, including inflammation, smooth muscle cell proliferation, and endothelial dysfunction. Research in the field of restenosis focuses on understanding the underlying mechanisms of the condition, developing new treatment strategies, and improving long-term outcomes for patients undergoing vascular interventions. These strategies may include drug-eluting stents, targeted drug therapies, and novel imaging techniques to monitor and prevent restenosis.