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What is the cause of a sudden sharp lower back pain? - sudden low back pain more condition_symptoms

My husband had a sudden pain in his back. After several minutes of activity could not move because the pain was so bad. Now he lies in bed and can hardly, because it can move without pain. Since insurance companies do not go to the doctor until tomorrow morning. Who knows what could be the reason for this, and nothing to alleviate his pain until he comes to the doctor?