I have excruciating pain after a click in my lower back while putting cream on my left leg. i tried stretching but there is no difference?

ER can evaluate: The more common causes of lower back pain include: back muscle strain, back ligament sprain, fractured vertebra (spondylolysis), slipped vertebra (spondylolisthesis), herniated disc, spinal stenosis, spinal arthritis; tumor in the spine, kidney, or elsewhere; fibromyalgia, etc... With such a long list of possibilities, the doctor can check. The ER is appropriate for "excruciating pain."