i have a lumpbelow my sternum, it causes pain, in short sharp bursts or sometimes throbbing, the pains usually only last a few minutes but can occur throughout the day. i went to the doctor who told me it was just cartiledge from my sernum, i went to another doctor who referred me to the hospital, but after two years i am still waiting for the appointment. Any idea what this could be? the lump can be move around a bit if i push on it.