It needs to be judged according to different situations, it is possible that inflammation occurs in the feet, the inflammation is often cellulitis, there can be redness, swelling, heat and pain, it needs to be treated symptomatically, applying antipathogenic microorganisms to treat, or applying certain drugs externally to treat. Gouty nodules can cause edema in the feet, which is often painful and severe, and taking hormones or painkillers may be effective. There is a clear history of trauma, and the skin may show a change in color. Appropriate treatment of the traumatized area can make the edema disappear. The most common type of foot swelling on one side of a medical condition may be unilateral limb thrombosis, and a lower extremity vascular ultrasound is needed to confirm the diagnosis.