right side lower back pain radiating into front ?

Hi, welcome to the ehealth forum and I am glad to help you.
Symptoms of kidney stones include sudden onset of excruciating, cramping pain in their low back and/or side, groin, or abdomen. Changes in body position do not relieve this pain. The abdominal, groin, and/or back pain typically waxes and wanes in severity, characteristic of colicky pain. It is often accompanied by nausea and vomiting. Kidney stones also characteristically cause blood in the urine. If infection is present in the urinary tract along with the stones, there may be fever and chills. Most kidney stones eventually pass through the urinary tract on their own within 48 hours, with ample fluid intake.
To establish the diagnosis and to rule out other causes of acute abdomen, further investigations such as CBC, ultrasound, CT scan (spiral) etc. might be ordered by your personal physician.
Hope this helps. Take care.
Note: This post is not to emphasise final diagnosis as the same cannot be made online and is aimed just to provide medical information and no treatment suggested above be taken without face to face consultation with health care professional.