<s>[INST] Hello. In the last 6 hours i have had extremely sore ribs on my left side. They feel like i have pulled a muscle. I can deal with this but what is worrying is the fact that I know have a numb left arm. I can still feel things and my hands and fingers work (hence this question) but it feels heavy and limp. What is possibly causing this and are they related?? [/INST] hello,Thank you for using healthcaremagic.I read your question and understood your concern.First you should rule out an miocardial infarction so you need to go to ER and do EEC.if Cardiologist rules out the MI than an cercical spondyloarthrosis or discal hernia might be the second option so you wanr to see an neurologist. all the best Dr. Selmani </s>