weakness in the face, arm, or leg especially on one side, sudden confusion, speech difficulty, vision trouble, and sudden severe headache with no known cause CDC. For these symptoms, the CDC says to call 9-1-1 right away. Do not wait to see whether the leg weakness passes, and do not drive yourself.
Breathing symptoms also change the level of urgency. The CDC notes that pulmonary embolism symptoms can include difficulty breathing, chest pain or discomfort that may worsen with deep breathing or coughing, coughing blood, fainting or lightheadedness, and a faster than normal or irregular heartbeat CDC. When leg swelling
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