The factor V Leiden mutation does not itself cause any symptoms. Since factor V Leiden is a risk for developing blood clots in the leg or lungs, the first indication that you have the disorder may be the development of an abnormal blood clot. Some clots do no damage and disappear on their own. Others can be life-threatening. Symptoms of a blood clot depend on what part of your body is affected. A clot in a deep vein This is known as deep vein thrombosis (DVT), which most commonly occurs in the legs. A DVT may not cause any symptoms. If signs and symptoms do occur, they can include:  Pain Swelling Redness Warmth  A clot that travels to your lungs Known as a pulmonary embolism, this occurs when a portion of a DVT breaks free and travels through the right side of your heart to your lung, where it blocks blood flow. This can be a life-threatening situation. Signs and symptoms may include:  Sudden shortness of breath Chest pain when breathing in A cough that produces bloody or blood-streaked sputum Rapid heartbeat 
factor leiden mutation cause symptoms  factor leiden risk developing blood clots leg lungs  first indication disorder may development abnormal blood clot  clots damage disappear own  can life-threatening  symptoms blood clot depend part body affected  clot deep vein known deep vein thrombosis (dvt)  commonly occurs legs  dvt may cause symptoms  signs symptoms occur  can include:  pain swelling redness warmth  clot travels lungs known pulmonary embolism  occurs portion dvt breaks free travels right side heart lung  blocks blood flow  can life-threatening situation  signs symptoms may include:  sudden shortness breath chest pain breathing cough produces bloody blood-streaked sputum rapid heartbeat 
factor v leiden