Phlebitis

Phlebitis, inflammation of the veins, usually causing a blood clot, or thrombosis (thrombophlebitis), and obstruction to blood flow. Pain, swelling, and redness over the vein are typical, with the vein's becoming a thick, tender cord. Occasionally, phlebitis indicates systemic disease (for instance, cancer). Treatment includes anticoagulant medication.

See also: Embolism.