Swollen feet are often caused by fluid buildup (edema), which can result from long periods of sitting or standing, heat, high salt intake, or minor injuries. In many cases, elevation, movement, hydration, and reducing sodium can help relieve swelling.
However, persistent or sudden swelling—especially in one foot or when accompanied by redness, pain, shortness of breath, or chest pain—may signal a serious condition involving the heart, kidneys, liver, infection, or a blood clot and should be evaluated by a healthcare professional.
