Brief Answer:
Two possible causes.
Detailed Answer:
Hi,
Thank you for using Healthcare Magic.
There are two possible causes of the pain. Firstly, as the injection of
morphine was not under medical supervision, did you take precautions to ensure that you administered it in a sterile way? You do not mention how long ago the injection was. There is a possibility that you may have a superficial infection in the veins of your arm. If this is the case, you may also have a temperature.
Secondly, morphine can cause localized
redness and inflammation with some itching. This is a recognised side-effect and will reduce over the coming hours. It is not serious.
I would suggest you wait and see how you feel over the next 12-24 hours. If you feel hot, develop a
fever or
chills then you do need to see a doctor for treatment of the infection. If there is a possibility that the needle and syringe were not sterile then you should be tested for
HIV and Hep B.
I understand your need for strong pain relief but you are putting yourself at risk by injecting morphine without medical supervision.
I hope this is of help. If you have any further questions, please do not hesitate to contact me.
Regards,
Dr K A Pottinger,
MBChB FRCA