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5. Unexplained Dyspnea (Shortness of Breath)
If you find yourself gasping for air while performing a mundane task—or worse, while sitting still—your lungs may be struggling to overcome a blockage. Sudden shortness of breath, often accompanied by a racing heart (tachycardia) or a feeling of lightheadedness, indicates that the heart is working overtime to pump blood through obstructed pulmonary arteries. This symptom is often the first and only warning sign before a major collapse.a pulmonary embolism in the human lungs, AI generated
