Hi, I am Suraj (age 22). From my childhood, i have problem of common cold. When i will take medicine, it will go for sometime and again it will come back. I used to ignore this until there is something severe. It is like my daily habit to clean my nose and throat by giving pressure by exhaling air. My throat is always filled with mucus/sputm. I feel bad to put it out because it makes critical sound also. Sometimes, i face difficulty to breathe because of this. Normal doctors used to test for eosinophil containt which is normal in me and i don't have asthma problem also. But, i am fearful that in future, it may create big problem. Please suggest something practical to know the root cause of this. I know, there is no permanent cure for common cold because its virus keeps on mutating.