Howdy, Have had a cold/flu for about 4-5 days, taking a cvs chest congestion relief tablet 2-3 times a day to loosen phlegm , drinking a lot of fluids, water-cranberry-v-8Fusion-&soda, no fever or runny nose yet, but very congested stuffy head and lungs w/occasional sporadic cough, trying to get rid of any phlegm in my system ( I hack it into the toilet to examine color (almost clear/white), my urine oddly has a better color now of very very light transparent yellow than before onset of cold/flu)), Anyway, about 2 days ago kidneys (mostly left)seemed a bit tender or painful! I went bowling to get out of the house today & it about brought me to my knees & stiffened my lower back! I have had kidney aches/pains before and just drank lots of cranberry juice and took tylenol/or ibuprofen! Do you believe kidneys are just sore from the hard sporadic coughing and using muscles in any area not commonly used! Or would you believe me to have a lung / kidney infection?? really hoping not to have stones, I don t want to put my wife through that ! God Bless America - Thank You For Your Input