What is phlebitis?

Phlebitis refers specifically to the inflammation of a vein, which can occur in response to a variety of factors such as infection, injury, or the presence of a clot within the vein. This condition most commonly affects the superficial veins of the legs but can occur elsewhere in the body. The inflammation is characterized by redness, swelling, warmth, and pain along the course of the affected vein. Recognizing phlebitis is important because it can lead to more serious conditions, such as thrombophlebitis, where a clot forms in the inflamed vein, potentially resulting in further complications if not treated properly.

The other options describe different medical conditions: conditions affecting arteries points to problems like arteriosclerosis, a clotting disorder involves issues with blood coagulation, and an infection in the lymphatic system, known as lymphadenitis or lymphangitis, involves inflammation of the lymph nodes or vessels. Each of these has distinct characteristics and implications that are separate from the inflammation of a vein.