In some instances, thrombosis can assume a more dangerous character if it leads to pulmonary embolism. This symptom occurs when the blood clot breaks free from the site of origin and travels to the lungs. As a consequence of the clot impeding blood flow to one or both of the lungs, you may develop shortness of breath and a rapid heartbeat. These symptoms are likely to arise abruptly, so you should go to the emergency room. If the blood clot somehow manages to block blood flow completely, sudden death may occur, though such incidence is admittedly rare.

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