One possibility that may cause numbness is phlebitis caused by infusion.

Phlebitis: inflammation of the blood vessel wall caused by stimulation of the blood vessel wall.

Clinical manifestations: The patient complained of burning pain, tightness and swelling at the injection site. With the blood vessels at the injection site, a cord-like red line will be produced, and sometimes there will be a feeling of hardness and fever during palpation. The infusion flow rate can be constant, slow or stopped, depending on whether thrombus is formed and the situation causing obstruction.

Risk factors for phlebitis include:

1. Material, length and diameter of catheter needle

2. Poor operation technology

3. Inappropriate puncture site

4, catheter needle indwelling time is too long

5. Improper fixing method

6. The infusion concentration is too acidic or too alkaline, or the incompatibility causes precipitation.

7. The patient's own pathophysiological condition, such as age or disease, leads to the fragility and inflammation of the blood vessel wall.

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You can apply hot compress to the inflamed area, and the symptoms should be improved within 3 days. If there is no sign of improvement, you should inform your doctor to evaluate whether there is bacterial infection. If wet hot compress is carried out, hot compress can be carried out with a damp and hot towel for 20 minutes each time, 4 times a day.

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If the doctor didn't change the medicine at that time, he just changed somewhere else, which means that the influence of the medicine is unlikely. It could be mechanical phlebitis at most.

If there is no improvement after the above methods, it is recommended that your relatives go to the hospital for investigation and treatment.