The pain of indwelling needle may be normal phenomenon, or it may be the pain caused by the medicine infiltrating into the tissue around the needle, or it may be the pain caused by the local phlebitis, the causes are different, and the treatments are different. 1. Physiological factors: the indwelling needle is an injection needle left in the patient’s vein, because it is a foreign body stimulation, so it can lead to the patient’s symptoms of pain, this is a normal phenomenon, usually without treatment. 2. Drug infiltration into the surrounding tissues: If the drug infiltrates into the tissues around the indwelling needle, it can also lead to pain symptoms, you can remove the indwelling needle, elevate the affected area, and use magnesium sulfate solution wet compresses and other ways to treat. 3. Phlebitis: If phlebitis occurs in the local area of the needle, it can also cause the patient to have painful symptoms, and the treatment can use magnesium sulfate solution wet compresses, polysulfonic acid mucopolysaccharide ointment, and can also use aspirin and other drugs as appropriate for treatment. Excluding physiological factors, if the symptoms of indwelling needle pain continue to be unrelieved, it is recommended to consult a doctor in time to find out the cause and ask the doctor to deal with it.