Blood clots are thickened masses of blood that form when the body needs to stop bleeding. They are a natural part of the healing process, helping to seal wounds and prevent excessive blood loss. However, when clots form inappropriately, they can lead to serious health issues, such as deep vein thrombosis or pulmonary embolism. There are several factors that can increase the risk of developing blood clots, including prolonged inactivity, certain medical conditions, and some medications. It's important to recognize the symptoms, such as swelling or pain in the legs, to seek timely treatment and prevent complications.