DVT stands for "deep vein thrombisis," commonly referred to as a blood clot in the leg. A DVT typically occurs in the lower part of the leg/ calf area when there is decreased blood flow in instances such as long car or airplane rides, prolonged sitting or immobilization after surgery, or if you have predisposing risk factors. Symptoms include calf pain at rest, redness going from your calf and traveling up your leg, extreme pain in the leg even at rest, or swelling or edema in one leg and not the other. To prevent a DVT from occuring, compression stockings may help. If you think you may have a DVT, call your doctor immediately and she may direct you to the closest ER for diagnosis and treatment.