A sprain or muscle strain causes low back pain in a broad area of the back. In some cases, patients may feel a pop or tear as the injury takes place, but this is not always the case. Pain associated with sprains or strains may appear on either side of the back and may get worse with muscle spasms that occur during activity or during sleep.

Patients often find that the pain restricts their range of motion. They may find it difficult to straighten up and maintain normal posture, or to perform everyday activities such as sitting, standing, walking or driving.

Symptoms usually occur for a period no longer than five to 10 days. Pain normally does not radiate into or cause weakness in the legs. These symptoms may indicate pressure on the nerves in the spinal cord or the presence of a neurological problem, and require examination by a physician.