Itching or Burning: Some people discover itching or perhaps a burning sensation around the impacted veins. Pregnancy: Improved blood volume and hormonal alterations for the duration of pregnancy can put added pressure on veins. 瓣膜弱化或受损可能导致静脉曲张。动脉将血液从心脏输送到身体的其他部位。静脉将血液从身体其他部位输送回心脏。为了使血液回流到心脏，腿部的静脉必须克服重力作用。 妙... https://www.sgvascularctr.com/varicose-veins-explained/