Waking up with puffy ankles or feeling heaviness in your legs after a long day may seem normal — but persistent or sudden leg swelling could be a sign of something more serious.

Known medically as peripheral edema , leg swelling occurs when excess fluid accumulates in the tissues of the lower limbs. While it can be harmless at times (like after standing all day), it can also signal underlying issues involving the heart, kidneys, veins, or lymphatic system .
Let’s explore what causes swollen legs, how to recognize the symptoms, and what steps you can take to find relief — whether through lifestyle changes or professional care.