كلية مايو كلينك للدراسات العليا في العلوم الطبية الحيوية 性别。女性更容易出现这种医疗状况。激素往往能使静脉壁松弛。因此，月经前、怀孕期间或绝经后的激素变化可能是一个促发因素。激素治疗（例如避孕药）可能增加患静脉曲张的风险。 Painless bleeding in the course of bowel movements. You could possibly recognize modest quantities of vivid pink blood on the toilet tissue or within the rest room... https://www.sgvascularctr.com/varicose-vein-treatment-in-singapore-comprehensive-advice-for-optimal-results/