Spider veins and varicose veins are a common disease
You will find detailed information in our vein dictionary
Thrombophlebitis is the technical term for inflammation of the superficial veins and often occurs when there are varicose veins. The inflammation causes local warmth, pain, redness, and swelling at the affected site. In some circumstances, the vein can be felt as an indurated (hard), painful thread or nodule.
Consult your doctor if you have any signs of thrombophlebitis, as it may lead to a deep vein thrombosis.