Thank you for the query.
This can be an infection indeed. However as the pain is quite strong, also kidney
stones should be considered. Especially if there is trace of blood in the urine, frequent urinating, burning while urinating. The pain usually radiates to the groin.
Other issues with such characteristic symptoms are less probable. He should have urine analysis, urine culture and abdominal ultrasound
. If there will be blood in urine and symptoms wont get better, urologist
should be visited.
Hope this will help.