Varicose veins are enlarged, twisted veins that commonly appear on the legs and feet. They occur when the valves within the veins weaken or malfunction, causing blood to pool and the veins to swell. This pooling of blood can lead to the characteristic bulging, blue or purple appearance of varicose veins. Factors like genetics, pregnancy, obesity, prolonged standing or sitting, and aging can contribute to their development. While they are often harmless, they can sometimes cause discomfort, pain, or complications like blood clots or skin ulcers. Treatment options range from lifestyle changes and compression stockings to medical procedures like sclerotherapy or laser therapy, depending on the severity of the condition.