Refer to hospital immediately.

Deep vein thrombosis (DVT) is a serious condition that occurs when a blood clot forms in a vein located deep inside your body. A blood clot is a clump of blood that turns to a solid state.

Deep vein blood clots typically form in your thigh or lower leg, but they can also develop in other areas of your body. Other names associated with this condition may include thromboembolism, post-thrombotic syndrome, and postphlebitic syndrome.