Lower left back pain is unlikely to be kidney pain. Kidney pain can be on the left or the right side of the back but is often higher in the back, while lower back pain with no other symptoms is likely to be muscular pain from a back injury, states MedicineNet.
If lower left back pain accompanies fever, flank pain, painful urination, nausea and vomiting, then the pain is likely to be kidney pain, according to MedicineNet. Patients who are pregnant and experiencing kidney pain should see a doctor immediately. Most commonly, kidney pain is the result of a bacterial infection, which doctors can treat using antibiotics and over-the-counter painkillers, such as Motrin.
Lower back pain on either side that does not accompany other symptoms may be the result of injury, sciatica, arthritis, compression fractures or herniating discs. Most lower back pain that is generalized and not due to kidney dysfunction is short-term and goes away within a few weeks with over-the-counter pain management treatment, states WebMD.
Patients experiencing chronic stress or mood disorders are more likely to develop chronic back pain. For lower back pain lasting longer than six weeks, WebMD recommends seeing a doctor for MRIs, CT scans or X-rays.