What condition is characterized by inflammation of a vein?

Phlebitis is the condition that is specifically characterized by the inflammation of a vein. This inflammation can occur in both superficial veins, which are located just under the skin, and deep veins, which are deeper within the body. The inflammatory process in phlebitis may cause pain, redness, swelling, and warmth in the affected area. It's important to identify phlebitis because it can lead to more serious complications, such as the formation of blood clots, if not treated appropriately.

In contrast, arthritis involves inflammation of joints, which is distinctly different from the inflammation of veins. Venous thrombosis refers to the formation of a blood clot within a vein, often associated with deep vein thrombosis (DVT), but does not indicate inflammation as a primary condition. Varicose veins are swollen and enlarged veins that usually occur in the legs but are a result of weakened valves and veins rather than inflammation itself. Thus, phlebitis is accurately defined by its focus on vein inflammation specifically.