Venous insufficiency: why legs swell and feel heavy

Venous insufficiency happens when the veins in the legs have trouble moving blood back up toward the heart. Healthy vein valves act like one-way doors. When those valves become weak or damaged, blood can leak backward and pool in the lower legs.

That extra pressure can cause swelling, aching, heaviness, cramping, itching, varicose veins, and skin changes near the ankles. Symptoms are often worse after standing or sitting for a long time and may improve when the legs are raised.

What helps

• Walk regularly. Calf muscles help pump blood upward when you move.
• Elevate your legs when resting, ideally above heart level when possible.
• Avoid sitting or standing still for long stretches. Flex your ankles or take short walking breaks.
• Wear compression stockings if your clinician recommends them. Ask first if you have known artery disease, poor circulation, or significant foot pain.
• Keep lower-leg skin clean and moisturized to reduce cracking and irritation.
• Let your clinician know about persistent swelling, skin discoloration, or sores that are slow to heal.

When to seek care quickly

Call your clinician promptly or seek urgent care for sudden one-sided leg swelling or pain, a new warm/red/tender area, an open sore, fever, or drainage from a wound.

Call emergency services for chest pain, shortness of breath, coughing blood, or fainting, especially if these happen with new leg swelling or pain.

The takeaway

Venous insufficiency is common and treatable. The goals are to reduce swelling and discomfort, protect the skin, improve blood flow, and prevent ulcers. If symptoms continue despite home care, a vascular ultrasound can help identify which veins are not working well and whether procedures may help.

Sources: MedlinePlus, Johns Hopkins Medicine, Cleveland Clinic, and the Society for Vascular Surgery.