Hello dear, Following are the cause of persistent dry cough: 1. Smoking 2. Asthma 3.Allergic rhinitis 4. Stress 5. Heart problem 6. Sinus problem 7. Tuberculosis 8. Whooping cough 9. Rare: lung cancer Tuberculosis in early stage may present with dry cough. But symptoms like mild evening rise fever, chills, night sweats, loss of appetite and weight, fatigue associated with it. But in the absence of above symptoms Tuberculosis is unlikely. But you should go for chest xray as early as possible to rule out tuberculosis and other causes. Also do test for sputum microscopy: that is very specific for Tuberculosis Take steam inhalation with tincture benzoin Stay hydrated by drink plenty of water (luke warm water) Hope this may help you. Wish you all the best for good health Best regards Dr. Sagar