Sitting for a long time can lead to swollen feet, which is caused by poor venous blood return, in this case you can first elevate both lower limbs and raise the ankle joint about 30 degrees, which can promote venous blood return through physiotherapy, and also can relieve local swelling and discomfort. And in general, you should also pay attention to appropriate physical activities and exercises, mainly the exercise of gastrocnemius muscle contraction, can promote venous blood return, to reduce local discomfort. Also, you can wear compression stockings when you move around, which also has a supplementary therapeutic effect. For the underlying diseases, such as increased abdominal pressure, chronic liver disease, also easy to aggravate the symptoms of foot swelling, so usually should also pay attention to prevention, active treatment of the primary disease, for varicose veins caused by foot swelling, if necessary, can also choose surgery.