However, a sudden change deserves more attention. Veins that unexpectedly become swollen, twisted, painful, or tender may indicate an underlying circulation problem. New heaviness or swelling in the legs can also be a warning sign that blood is not flowing normally through the veins.
One possible cause is chronic venous insufficiency, a condition in which blood has difficulty returning from the legs toward the heart. This can contribute to varicose veins, aching, swelling, and a feeling of heaviness, particularly after standing for long periods.
A more urgent concern is deep vein thrombosis, or DVT, which occurs when a blood clot forms in a deep vein. It can cause pain, warmth, swelling, or changes in skin color, although symptoms can vary and may sometimes be subtle.
