I wake up, almost every morning, with a cough, as if I have a cold; a cough as if I need to expectorate from the lungs......(Sorry, I m not sure if I m explaining myself correctly. Hope you understand.) After a while, it goes away. No headache or cold-like symptoms other than on some days I may also have a little bit of a runny nose. Sometimes my lower back also hurts me in the mornings, but I ve had back pain for a long time, so I don t know if one thing has to do with the other. After a while, it all goes away. Why does this happen? Thank you