Deep vein thrombosis (DVT) is a condition that occurs when blood clots form in veins deep inside your body. These clots can occur anywhere in the body. However, this condition often affects the lower legs or thighs. Symptoms of DVT include swelling, pain or tenderness, and skin that may feel warm to the touch. DVT can happen to anyone. But you have a greater risk of developing DVT after a surgery or trauma. Being overweight and smoking are also risk factors. DVT is a serious condition because a blood clot can travel to the lungs and block an artery. This is called a pulmonary embolism. Risk for this condition is also higher after a surgery. Since DVT can lead to serious complications, your doctor may recommend DVT compression stockings to reduce swelling and improve blood flow to your heart and lungs. If you’re not familiar with how these stockings work, here’s what you need to know.