I have been facing this issue since years. There is a sudden accumulation of Mucus in my chest and Thorat without any Recent Cough and Cold history. And it's gets so worst that i have chest pain after it and slightly shortness of breath in between for few minutes. And smell in breathe too. I constantly have to take hot fluids to rid of it but it comes back within few weeks or months and the same repeats. Is there any solution to it.