Brief answer Tuberculosis or lung cancer Detailed answer Hi Greetings i have read your question and i think i have a good piece of advice for him weight loss, chronic cough and fever are most consistent with either Tuberculosis or a Lung cancer i would like to know to help you better about his age does he smoke or a reformed smoker?? if i were his treating doctor i would advised for a series of lab tests like complete blood count, ESR, Liver function test, Renal function test X Ray chest and if all these are not conclusive than CT Chest and bronchoscopy meanwhile you can tell him for steam inhalation and deep breathing exercises a cough syrup multivitamin tablets for supportive care Hope I have answered your question. If you have any further questions I will be happy to help good luck Dr BR Hudda