When pulmonary embolism occurs due to thrombosis, it is medically referred to as thromboembolism. You may suffer from dizzy spells. When the clot is not too large, the breathing problems and chest pain may manifest later while the dizziness begins to occur early on. Many times, you might not take the dizziness seriously. Furthermore, your medical provider may have difficulty ascertaining the cause. When other symptoms of pulmonary issues begin to appear, you might make the connection between the decreased amount of oxygen in the body and fainting spells.

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