The evaluation of testicular pain should involve the care of urologists and the evaluation of back pain should involve the care of physical therapy physicians, orthopedic surgeons, neurosurgeons, and pain specialists. Independently, testicular pain and low back pain can be from a number of different causes. There are also several causes that may be associated with the two symptoms together. Such symptoms, given your age, could be from kidney stones (nephrolithiasis) that may be causing obstructing symptoms leading to discomfort. Testicular torsion is possible and can lead to similar symptoms, but this is typically a medical emergency. Abdominal wall hernias, such as inguinal hernias, can cause this, are quite common in some age groups. Problems in the back leading to nerve damage can cause this type of pain. Rarely, cancers can cause these symptoms, such as lymphoma, but this should be evaluated. The treatment plan would vary substantially based on the diagnosis. Kidney stones may be managed conservatively or with non-invasive or invasive procedures. Torsion requires surgery, as well as abdominal wall hernias. Back issues can be treated with medication, physical therapy, and sometimes surgery.