How long can I wait with swollen leg to see if it goes away without seeing a doctor?

Seek help now. Swollen legs are seen after prolonged standing; heart or kidney problems; venous insufficiency; blood clots; prior injury or surgical procedures; lymphatic obstruction, etc. The evaluation of swollen legs requires a thorough evaluation, including ultrasound study of the venous system of the legs. The treatment may be a simple one, but may also be quite involved, so seek help now.