i have been having pain and numbness in my left arm for over a month, what may be the cause?

Hello. Thank you for your message.

I'm assuming you don't consider this a medical emergency since you are writing to us. If you feel it is, don't hesitate to seek medical help.

Pain (and numbness) in your left arm could mean many things, you have a joint injury, a muscle strain, a pinched nerve, or a problem with your heart.

Read more here: https://www.healthline.com/health/pain-in-left-arm

Helena