Hi welcome to the health care magic Here you are having acute pain in breast area since four to five days It could be mastitis like breast infection or inflammatory condition or there might be pain from muscular strain... Local breast examination along with palpation needed to detect if any mass present... For inflammation relief anti-inflammatory drug like ibuprofen prescribed for five days Warm compress useful Avoid strenuous work and take rest According to cause specific treatment given If no obvious redness like inflammation present and if doesn t suits in muscular pain that better to investigate with EKG for that Take care Consult physician or surgeon for examination