问:大夫,我是一名退休小学教师。几年前,我发现每当站立时间过久,双腿就有酸胀,甚至疼痛的感觉,但稍稍休息又恢复正常。近来出现皮肤色素沉着。我先后到当地医院和省级医院检查,均确诊为“单纯性下肢浅静脉曲张”,主张手术治疗。请问大夫,这种病是怎样引起的?有哪些治疗方法?手术后有没有后遗症? Q: Doctor, I am a retired primary school teacher. A few years ago, I found that whenever I stood for a long time, my legs had a sore, sore feeling, but returned to normal after a short rest. Skin pigmentation has recently appeared. I have to the local hospital and provincial hospital examination, were diagnosed as “simple lower extremity varicose veins,” advocating surgery. May I ask the doctor, what is the cause of the disease? What are the treatments? Are there any sequelae after the operation?