Understanding Phlebitis: Causes, Symptoms, Complications, and Nursing Interventions Phlebitis is a condition that occurs when a vein becomes inflamed. This inflammation can cause pain, swelling, and redness in the affected area and can also decrease the flow of IV. Phlebitis can have many causes, including irritation of the vein by a foreign body or irritating medication, injury to the vessel wall from the catheter, or infection linked to bacterial contamination of the IV. Phlebitis can lead to

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