Thanks for your question on Health Care Magic. I can understand your concern. Normally bronchus are not visible on chest x ray. But when bronchus are inflammed, their walls are edamatous and thickened. These thick walls are visible on chest x ray. Same thing is happening in your case. So possibility of either infection or bronchitis is more in your case. Smoking and allergies are the most common cause for this. So if you are smoker than quit smoking as soon as possible. Also consult pulmonologist and get done clinical examination of respiratory system and PFT (Pulmonary Function Test). You may need antibiotics, antihistamines, inhaled bronchodilators and inhaled corticosteroid. So better to first diagnose yourself and then start appropriate treatment. Hope I have solved your query. Wish you good health. Thanks.