My Father is 65 years old. He is suffering from cough which stands for a week or sometimes more than 6 months from last 4-5 years. We have tried all the test which doctors suggested like X-rays, etc. Also continued medicine/syrups for some time but no effect observed. It's also observed that cough returns mostly with some environment changes like rainy, cold, humid. It remains for some unsustainable period and the suddenly goes off. Didn't understood the problems. When it comes it gives us a thrill because its really intense cough. Please Experts suggest some immediate/ long term relief. Thanks in advance for your valuable feedback.