hello, i will tell you some of the symptoms of lung cancer so that you can check once and if you are sure that you are having those symptoms you can surely ask your doctor to investigate you for your satisfaction and to rule out the disease. Many symptoms of lung cancer affect the chest and air passages. These include: Persistent or intense coughing Pain in the chest shoulder, or back from coughing Changes in color of the mucus that is coughed up from the lower airways (sputum) Difficulty breathing and swallowing Hoarseness of the voice Harsh sounds while breathing (stridor) Chronic bronchitis or pneumonia Coughing up blood, or blood in the sputum -coming about the investigations i will also give information about that to you Physicians use information revealed by symptoms as well as several other procedures in order to diagnose lung cancer. Common imaging techniques include chest X-rays, bronchoscopy (a thin tube with a camera on one end), CT scans, MRI scans, and PET scans.Physicians will also conduct a physical examination, a chest examination, and an analysis of blood in the sputum. All of these procedures are designed to detect where the tumor is located and what additional organs may be affected by it.Although the above diagnostic techniques provided important information, extracting cancer cells and looking at them under a microscope is the only absolute way to diagnose lung cancer. This procedure is called a biopsy. If the biopsy confirms lung cancer, a pathologist will determine whether it is non-small cell lung cancer or small cell lung cancer. THANK YOU .HOPE THS INFORMATION WILL HELP YOU.