What causes severe weight lost in arms and legs and the veins in these limbs to suddenly protrude? I unintentionally began to loose a lot of weight after undergoing a tubal ligation surgery.But what is alarming is that the weight loss was more in my arms and legs. Additionally the veins in both arms and legs have become quite noticeable and at times very painful - especially in my arms. They literally feel as though they are being pulled. My both calves also ache as evening approaches.