No flow: I assume you mean a vein that recently had a needle or iv. Veins may collapse or blow when fluid goes through them or blood is drawn from them. Phlebitis, inflammation of the vein, or a lumpy spot called a thrombosis may result. Neither is serious. Both are treated with warm compress and advil or tylenol (acetaminophen) for pain.
Answered 5/20/2018
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