I have phlegm in the back of my throat after my cold has been gone for a while, the phlegm stays. However, that's bringing concern because if I try clearing my throat I get a sharp pain in my lower left and side and the muscles on my right side tense up and tighten. I am overweight, which may or may not be relevant. I visited a clinician and he said that my lungs sounded great and the mucus was exclusive to my throat, he did not however provide and explanation on how to treat or explain my side