If fluid buildup isn’t responsible for the swollen legs, it could be inflammation. Popular causes of inflammation incorporate: Obesity: Carrying surplus excess weight can strain leg veins, bringing about leg swelling and fluid retention. An an infection during the feet, ankles, or lower legs can cause swelling in the area. https://www.sgvascularctr.com/swollen-leg-why-do-i-have-it-and-what-can-i-do/