Having sudden lower back pain (have had back pain in the past). took advil (ibuprofen) with no help. hurts to sit, stand, lay down.

Back pain: Back pain can be caused by a number of factors including muscle strain, ligament injury, nerve irritation, vertebral injury or inflammation or internal organ issues. If the pain came without any clear ttrigger it is more worrisome. Could be something like a kidney stone. If medication not helping some therapy might. See your doctor for this to see if further imaging studies may be indicated.