hi doctor,frank here ,i have this terrible flu for the last two weeks , being treated with antibiotic but it still lingers on i now have spain in the lower side of my back and it gets worst when i cough , is this pain due to cough or kidney problem , could you please advise me cheers  Frank
Hello and Welcome to Chat Doctor, I had gone through the case and found that it might be due to most probably by cough because some time long duration of cough causes swelling of interstitial tissue of rib. So for precaution you go for some investigation-Kidney Function Test. Urinalysis and culture. If required then ultrasound of lower abdomen. Hope everything will be normal and take any decongestant cough syrup. Chat Doctor.