Peripheral Arterial Disease (PAD) is a common circulatory condition where narrowed arteries reduce blood flow to the extremities, particularly the legs. This results in pain, cramping, and discomfort when climbing stairs. PAD is primarily caused by the buildup of fatty deposits, or plaques, on arterial walls, which hinders proper blood circulation. If left untreated, PAD can lead to severe complications such as chronic pain, difficulty in mobility, and, in extreme cases, non-healing wounds or gangrene, potentially requiring surgical intervention to address the condition effectively.