<s>[INST] Hello Dr. Sam , My name is sue , I want to ask about my husband , he had pain for the last week in the middle of his back going through his left side down tummy. his doctor thought a stone in kidney but in xray didn't show any what it shows the enlarge prostate which he already got it and he is taking medicine but it seems it is getting bigger .during this weekend I just need to know the pain in his back because it is really very painfull.thank you [/INST] Hello,There are plenty of causes for the symptoms you have mentioned ie Pain in the mid back.As your doctor ruled out the kidney stones, it may be due to other causes such as Overuse, muscle strain, or injury to the muscles, ligaments, and discs that support your spine or Myofascial pain that affects the connective tissue of a muscle or group of muscles.As he have pain radiating to tummy, it could be due to mobile small kidney stones or appendicitis.My advice is to do ultrasound abdomen to rule out any stones or appendicitis.If everything is normal, better try any bed rest and pain killers like Aceclofenac or Ibuprofen.Hope this helps.Please write back for further queries.wishing you good health. </s>