<human>: Hi,Yesterday evening I got a pain in my chest. More to the left. I thought maybe it was a pulled muscle but I havent done anything strenous or lifted any heavy objects. I can feel a large lump on my collar bone. It hurts to move in certain ways. Any idea what this could be? Thanks,Sarah
<bot>: Hello! Thank you for asking on Chat Doctor! Facing your current clinical scenario, I would strongly recommend performing a medical check up by your internist (GP), to investigate the reason of your neck lump (a lymph node, a lipoma, abscess, any other inflammatory process, etc.) and a possible association with that left sided chest pain. A careful physical exam, chest X-ray, ultrasound of that lump mass, and possibly a biopsy may be necessary for the differential diagnosis. In addition, an ECG, complete blood count, PCR, etc. Will be helpful. Hope to have been helpful! Greetings! 