Thanks for writing to health care magic.
I can understand your concern.
One important cause for his back pain
and frequent urination
could be urinary tract infection
. He should be definitely investigated for the frequent passage of urine. Please get him examined by a specialist and get him investigated based on the advise of the specialist.
Continue to ask further queries as required.
Hope this helps.
Dr Y V Siva Sankara Murty
Associate Professor of Pediatrics