Final answer:
Varicose veins are a common condition where defective valves in the veins of the lower limbs cause blood to accumulate and distend the veins. This can lead to visible, twisted veins on the skin and may be accompanied by edema. Treatment options include support hose, elevating the legs, and surgical interventions, depending on the severity of the condition.
Step-by-step explanation:
Varicose veins are a partial or complete occlusion of superficial or deep veins caused by defective valves that allow blood to accumulate within the veins. This leads to the distending, twisting, and visibility of the veins on the surface of the skin. Varicose veins are commonly found in the lower limbs and may be accompanied by edema, which is excessive fluid accumulation in the tissues. Without treatment, varicose veins can worsen over time and cause pain and discomfort.