Pain is sometimes a symptom of blood clots and deep vein thrombosis, but not always, according to WebMD. Not everyone who develops a blood clot or DVT experiences pain or symptoms; in fact, around half of all instances of DVT occur without any symptoms at all.
DVT occurs when a blood clot forms inside a deep vein, typically in the thigh or the calf muscle, blocking the flow of blood. Usually, DVT causes pain and swelling in the affected leg or in both legs, and the skin on the affected leg may become red, discolored and warm to the touch. The legs may feel fatigued and surface veins may become more noticeable, notes WebMD.
When a blood clot breaks loose and finds its way into the lungs, pulmonary embolism occurs. This can be life threatening. Symptoms of pulmonary embolism include sudden coughing that may result in spitting up blood, rapid breathing, sharp pains in the chest, shortness of breath and feeling light-headed. People who are at the greatest risk of DVT are those over the age of 60, smokers, people with weight problems and those who lead a sedentary lifestyle, although anyone can develop the condition. People experiencing symptoms of pulmonary embolism should seek emergency medical attention, as the condition can be fatal, warns WebMD.