My sister has a lump in the middle of her chest, about the size of an egg, and is situated more towards the right side just off from the right-hand side breast. She experiences crushing pain radiating outwards, breathlessness, and back pain. The pain is relieved after lying down a while. It is aggravated by standing too long, folding clothes or sitting too long. When she leans over she can feel pressure in her chest. She also has undiagnosed lumps in her breast. Any information would be great!!!