Welcome to health care magic.
1.Such kind of the
radiating pain and discomfort can be in the first place
lumbar spine when there is any disc bulge causing nerve compressing - which is generally treated with back exercises at your age.
2.Next possible cause could be KUB - kidney
urinary bladder infection / obstruction can give the above symptoms.
3.Finally if there is any inguinal hernia causing above symptoms is also possible.
4.If its is an ongoing issue and causing discomfort - i would recommend to get an
ultrasound abdomen and pelvis and
scrotum to evaluate cause.
5.If not disturbing much, you can try with back exercises, and plenty of water in terms of urinary symptoms - and try for couple of weeks, no response means needs further evaluation.
Good luck.
Hope i have answered your query,
any thing to ask ? do not hesitate to ask.
http://doctor.healthcaremagic.com/doctors/dr-ganesh/62888