Thrombosis is a medical condition where a blood clot forms in a blood vessel, which can block the flow of blood. This can happen in veins or arteries and can lead to serious health issues. For example, if a clot forms in a vein in the leg, it can cause a condition called deep vein thrombosis (DVT), which may lead to swelling and pain. If a clot travels to the lungs, it can cause a pulmonary embolism, which is a life-threatening situation. Thrombosis can occur due to various factors, including prolonged inactivity, certain medical conditions, or even genetic predispositions. Recognizing the signs early is crucial for effective treatment.