Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice. Pulmonary function tests will tell you whether you have obstructive airway disease or restrictive airway disease. A thorough history is required including your habits like smoking, exposure to dust and occupation. I will tell you in brief the difference between two. Your condition an lie in any of those. Obstructive lung disease and its characteristic narrowing of pulmonary airways hinder a person’s ability to completely expel air from the lungs. The practical result is that by the end of every breath, quite a bit of air remains in the lungs. Some common conditions related to obstructive lung disease include: 1. Chronic obstructive pulmonary disease (COPD), which encompasses emphysema and chronic bronchitis 2. Asthma 3. Bronchiectasis 4. Cystic Fibrosis People suffering from restrictive lung disease have a hard time fully expanding their lungs when they inhale. That is, it’s more difficult to fill lungs with air. This is a result of the lungs being restricted from fully expanding. Some of the conditions classified as restrictive lung disease include: 1. Interstitial lung disease 2. Sarcoidosis 3. Neuromuscular disease, such as amyotrophic lateral sclerosis (ALS) 4. Pulmonary fibrosis We need to correlate your history, X-ray findings and pulmonary test findings to arrive at a diagnosis as to what is the problem. I suggest you to meet a pulmonary medicine specialist who may help you. With Regards Dr Sanjay kini