<s>[INST] I have been having pain on under my right abdominal and back for about the past week now It hurts to walk, lay down, cough, breathe (sharp apin when I tke a deep breath).... almost anything I do I went to the ER a day ago where I was given an untrasound and an xray which both were normal They then did some blood work and the result came back positive The doctor thought that I had a blood clot in my lung so I got a CAT scan whicChatDoctore out normal I was then discharged and given some motrin and narcos for the pain which neither of them seem to help The pain is agonizing. What could it be? [/INST] Hello there, Welcome to Chat Doctor. The kind of pain you mentioned, if you are a smoker or else due to some lung problems, might be due to formation of small air pockets in pleural space(pneumothorax), which at times get resolved on by own or with oxygen therapy. It could be as simple as a muscle spasm, a back muscle/ ligament sprain. Specially, sharp pain related to cough or breathing are generally related to pleura(sac, covering the lung), which is probably posted some lung infection. So better wait and keep seeing your doctor. Get well soon. </s>