Hi guys! I am 24 years old and I have been encountering cough, fatigue, runny nose with green discharge, swollen and tender lymph nodes in neck for 3 days now and today I have coughed frothy mucus. Are these signs of phlegm throat? Is this a really serious problem? I want to know about its possible causes and treatment? Do I need to have some kind of test done for confirming this phlegm throat condition?