Etiology for the swelling of the lower legs in an individual who is having a desk job or a long sitting hours or a long travel, which is very common and may not be related to a pathology, It may be a simple dependent edema, which we call in the medical language, which occur in long travel or long hours of sitting or lower limb or leg will get a lot of fluid accumulation by the end of the day or by rest or elevate your limb when you get up in the morning. The disappearance of the edema which itself shows it is a benign cause and it may not be related to any of the pathologies like kidney problem, less hemoglobin, less amount of protein in the body. All these things can be ruled out.