Thrombophlebitis is a condition characterized by the inflammation of a vein, often accompanied by the formation of a blood clot. This typically occurs in the legs but can happen in other areas as well. Symptoms may include redness, swelling, warmth, and pain along the affected vein. The condition can be caused by various factors, including prolonged inactivity, injury, or certain medical conditions. While thrombophlebitis can be painful, it is often treatable with rest, compression, and anti-inflammatory medications. In some cases, medical intervention may be necessary to prevent complications.