Me too @Pammy46 I had lumpectomy and sentinel nodes removed March with follow up widening of surgical margin.Then 16 rounds radiotherapy- left side and is lobular. Had a course of antibiotics due pain in arm recently believed to be cellulitis - just finished and noticed rapid improvement after 24 hrs on drugs.Last night visited emergency at local hospital as chest pain getting worse - had ecg , blood tests and X-rays heart is ok so a relief. Given fo m for ultrasound and going to see onc asap. Am on Letrozole as er+ and 6 monthly Prolia jabs for osteoporosis. Read a lot of ladies complaining of similar months afterwards - one mentioned costochronditis - have a look back at previous posts we are definitely not alone - is a search bar on homepage use terms like breast/ chest pain . It's great to know we are not alone but I'd still get it checked by your oncologist just to be safe. Can imagine the thoughts running thru your mind and needs to be settled by a professional