Deep Vein Thrombosis
DVT is the medical term used to describe a blood clot in a vein deep within the body. The most common place for DVT to occur is in the legs. These veins are much larger than the veins close to the skin's surface, meaning blood clots can become quite large. All or part of a large blood clot can break free and travel to the heart and lungs, interfering with circulation and lung function.
DVT causes blood flow to slow down or stop. This leads to “congestion” of the blood behind the clot, resulting in swelling, pain and redness of the affected area.