Most often you would get swelling, pain, and possibly nausea and/or dizziness if in the neck. Most blood clots however occur in the lower body. I would see your doctor asap or go to the ER if you suspect a clot. The reason clots are serious is because if it breaks and travels it can clog an artery. For example a pulmunary embolism is when a clot blocks the artery of the lungs.
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