Thrombosis: It's not uncommon for a vein to thrombus (clot) if it's been cannulated. It will feel firm, perhaps a bit sore, and could appear puffy. If there's associated redness, inform your doctor. With time, the vein should recanulate (open up) but not absolutely. Of nominal concern. Good luck.
Answered 2/15/2014
4.5k views
Superficial clot.: Occasionally following an IV insertion, the vein can become irritated from the IV solution and form a clot. This is called superficial phlebitis and is not dangerous. The clot does not move but it is easily felt and sometimes painful. Initial treatment is a warm compress. If not a clot in the vein then the vein can be bruised and irritated from the needle insertion and swelling can occur.
Answered 1/12/2017
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