| SYMPTOMS
- Sudden and isolated pain in an arm or - sometimes followed by skin discoloration, tingling, numbness, or a cold feeling just below the site of pain - suggests a large clot blocking blood circulation. If left untreated gangrene (tissue death) could result.
- A hard, bluish lump in a vein may be caused by a large blood clot.
- Sudden partial or complete blindness in one eye may be due to a blood clot blocking a retinal artery.
- Violent dizziness, or vertigo, that impairs your ability to stand or walk may be caused by a small blood clot blocking a cerebral artery.
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