<s>[INST] Hi.  I was diagnosed with stage 4 lung cancer, on April 19th.  It is in my left lung, and my liver.  My question is, can tumors move?  Normally when I have pain, it is in the left lung area, about 2-3 ribs below my breast...but the past several days, it has hurt, pretty much constantly, at the bottom of my rib area.  Thanks in advance! [/INST] Thanks for your question on Chat Doctor. No, lung and liver malignant tumor can not move. They certainly enlarge in size and involve more surrounding areas. So you're worsening of pain at different site suggest possibility of tumor spread. So better to consult oncologist and get done fresh CT thorax with Contrast and PET scan to rule out spread of tumor. You can take centrally acting painkiller for relief in pain. </s>