phlebitis

Inflammation of the wall of a vein. It is sometimes associated with varicose veins or with a blockage by a blood clot (thrombosis), in which case it is more accurately described as thrombophlebitis.

Phlebitis may occur as a result of the hormonal changes associated with pregnancy, or due to long-term use of contraceptive pills, or following prolonged immobility (which is why patients are mobilized as soon as possible after surgery). If a major vein is involved, nearly always in a leg, the part beyond the blockage swells and may remain engorged for weeks. It is very painful. Treatment is with anticoagulant drugs and sometimes surgery, depending on the cause.