Question: are all blood clots bad?
Answer: Blood clots can be dangerous. Blood clots that form in the veins in your legs, arms, and groin can break loose and move to other parts of your body, including your lungs. A blood clot in your lungs is called a pulmonary embolism (POOL-mo-nar-e EM-bo-liz-em). If this happens, your life can be in danger.