Hi welcome to the health care magic You are having left side chest pain and it is referred to neck, shoulder area... Hence cardiological causes like ischemic heart disease should be ruled out first.. For that work up done as follow... -Auscultation -EKG -Tread mill -if needed further investigation like troponin estimation and echo done According to cause specific treatment given If no cardiac causes present than this presentation could be from stress induced or muscular pain.. Take care Consult physician or pulmonologoist for examination with keeping all this in mind Hope your concern solved