<s>[INST] Hi, may I answer your health queries right now ?  Please type your query here...Why do I have lower bache pain with my flu, whicChatDoctores and goes as my flu dies and lifts or returns. It is reducing over days but I am a little concerend. Could the flu virus be affecting my kidneys? [/INST] Hi Dear, Welcome to Chat Doctor. Understanding your concern. As per your query you have back pained with symptoms of flu which is because of upper respiratory tract infection leading to common cold, which can be caused by bacterial or viral infection. Need not worry. I would suggest you to consult ENT specialist for proper examination. Doctor may order test like viral culture test, throat swab test and blood test to confirm the diagnosis and rule out causes. Doctor may prescribe antibacterial amoxicillin or anti-viral acyclovir depending upon the diagnosis along with decongestants. You should take proper rest and Chat Doctor.  You should take muscle relaxants as well. You should take steam inhalation along with vaporizers. Avoid hot, sharp, spicy food. You should do warm saline gargles and  </s>