The indwelling needle intravenous injection is suitable for patients with long-term infusion, and its hazards include the possibility of mobility inconvenience, local infection, and vascular air embolism. 1. Inconvenient activities: the indwelling needle will affect the patient’s dressing, bathing, eating, etc., and the pain is more obvious when moving. 2. Local infection: long-term retention of indwelling needle, puncture needle left in the blood vessel may be secondary to bacterial infection, resulting in bacteremia or necrosis, leading to vascular necrosis. 3. Vascular air embolism: the process of activity may lead to air into the blood vessels, with the blood circulation flow to the lungs, and in severe cases, it will block the pulmonary artery pathway, leading to confusion, convulsions and other symptoms, and even lead to death. Try to avoid strenuous exercise during the use of indwelling needles, and actively communicate with your doctor if you feel unwell.