Final answer:
Peripheral artery disease (PAD) and varicose veins are conditions that can affect the lower extremities, causing pain and discomfort due to narrowed arteries or faulty venous valves.
Step-by-step explanation:
Conditions such as peripheral artery disease (PAD) and varicose veins may occur in the lower extremities. Peripheral artery disease develops due to the narrowing of peripheral arteries, primarily caused by atherosclerosis, and typically results in intermittent leg pain when walking. Varicose veins are another condition that can manifest in the legs, where faulty valves in the veins cause blood to pool and veins to become enlarged and twisted. PAD and varicose veins are not just cosmetic issues; they can cause discomfort, pain, and, in the case of PAD, even lead to more serious conditions like heart attacks if the underlying atherosclerosis is not managed.