You may be having paraspinal muscle spasm. The paraspinal or erector spinae muscles along either side of the spine run the full length of the back. These act to support the spine and also help the spine extend to a neutral, straight back.

Studies show increased paraspinal muscle activity even at rest for individuals with low back pain. Paraspinal muscle spasm put pressure on the discs. The compression then irritates the joints of the spine.

Can you think of any repetitive motion that could be causing this problem? Perhaps turning or twisting to one side over and over?

If your symptoms don't go away in three to five days, see a doctor or a physical therapist. Early intervention can go a long way in preventing chronic back pain and disc problems.