Lower left back pain is most often the result of a pulled muscle on that side.
The muscle strain can occur as a result of improper lifting, work related injury, attempting to lift an object that is too heavy or awkward, or at times even what appears to be a minor incident such as a sudden turning, twisting, bending forward, yard work, prolonged sitting, or house cleaning.
Very often the cause cannot be traced to a specific incident. This is most often the case when you wake-up in the morning and upon getting out of bed notice the pain and assume you perhaps slept on it wrong.
In reality the injury that is causing your pain occurred a day or even two before the noticeable onset of pain.
If the lower left back pain is not associated with radiating pain, numbness or tingling down the left leg it is most likely due to a muscle strain or perhaps a facet syndrome. A lumbar strain will be more painful upon forward bending; where as, a facet syndrome is more painful with backward bending or hyper-extension.
In the majority of the cases with chronic pain in lower left back there will be an associated pelvic tilt or low left hip. This must be fully evaluated to determine if the tilted pelvis is due to muscle spasm, a true short leg, flat feet, excessive pronation or a combination of the these.
You can also experience referred left lower back pain. In this case the pain may be more lateral to the spine and the complaints would be one of left flank pain or what is more commonly referred to as lumbago. Referred left low back pain is less specific in location and the sufferer of this type of pain will often describe the pain as being a vague ache. The individual with pain in lower left back of this nature usually is unable to pinpoint the pain. Feeling or pushing on the area usually does not elicit a pain response.
Keep in mind that left sided lower back pain can come from diseases of the kidney, urinary tract, or colon. With vague lower left side back pain not related to an injury a thorough examination and assessment should be conducted to rule out other underlying diseases.
If the pain is originating from a fracture
there should be a history of some traumatic incident. However, bone cancer, osteoporosis and other bone related disease can cause spontaneous fractures due to minor incidents such as bending or lifting.
As always a full and thorough evaluation should be conducted by a healthcare professional.
Most chronic left side lower back pain is of a muscle origin and will continue to present itself until the perpetuating or contributing factors are uncovered and treated appropriately.
One must always take an active role in treatment. Habits need to be evaluated, structural deficits need to be corrected, dysfunctional muscles, nerves and spine need to be restored to a more normal state and one's overall fitness level needs to be measured and improved upon if necessary.
A passive approach and treatment with emphasis on symptom suppression, muscle relaxers, and pain killers will only lead to further chronicity, dysfunction, debilitation, an overall poor state of health and quite possibly a shortened life-span.