<s>[INST] Hello Dr, lately i have been spitting up little brown flakes of mucus it seems i have been having little upper back pain only dull pain but noticable at times, also i have had some blood test done and other things i have high cortisol and high blood pressure we have yet to find the causes, im starting to get worried cancer runs in my family so i dont really know what to think. im only 18 years old and i am a smoker. could it just be a lung infection or something.? [/INST] Hello welcome to ChatDoctorim afraid to inform you that the brown speaks are CLOTTED BLOOD PARTICLES and if cancer runs in your family then to be on the safer side you should get yourself screened urgently by getting following investigations(1) X-ray OF CHEST(2) CT SCAN(3) BRONCHOSCOPYonce you get these tests done either send us a scanned copy of your reports or consult your doctor for the evaluation of your reportsregardsChatDoctor </s>