I have a sore throte, lower back pain and dark brown urine?

Dark urine: For a 7 year old this is not normal - please go to the hospital and have yourself checked out.

Urinalysis : Please see an urgent care center right away or your own pediatrician. There may be a UTI or glomerulonephritis . Sometimes kidney disease is associated with Strep throat infection. Please have a urinalysis with microscopic examination. They will also check his blood pressure.