Contact your doctor if:
Severe back pain makes it impossible for you to do your normal daily activities.
Your back pain follows significant trauma.
Mild back pain gets worse after a few days or persists more than a week or two.
Back pain is accompanied by weight loss, fever, chills or urinary symptoms.
You develop sudden weakness, numbness or tingling in a leg.
You develop numbness in the groin or rectum or difficulty controlling bladder or bowel function.
You have had cancer previously and you develop persistent back pain.