Blood Clots:
Over time, varicose veins enlarge and blood tends to pool in large bulging veins. In some cases, blood clots can form in these superficial veins yielding firm, tender veins that are slow to resolve.
Progression:
Varicose vein disease will never improve, go away, or cure itself. It will only get worse, increasing in size, number and extent on the legs. The result is worsening symptoms of heaviness, aching, swelling, etc. Also, untreated vein disease can contribute to an increased number of spider veins in your legs.
Fatigue:
As time goes by, your legs will become increasingly heavy and tired.