Tingling pain in the left side of the lower back can be caused by two reasons: 1. It may be caused by lumbar muscle strain or third lumbar vertebral transverse syndrome. 2. If it is lumbar muscle strain, it is usually a widespread lumbar tingling; if it is the third lumbar vertebra transverse process syndrome, it is usually in the third lumbar vertebrae in many places tingling is more obvious, and press the third lumbar vertebra transverse process place, the pain is more clear, and may lead to local lumbar vertebrae muscle spasms. 2, it may be a renal disease, for example, caused by renal calculi or urinary tract infections. If it is a kidney stone, usually the onset of localized stabbing pain, accompanied by pain in the lower abdomen on the left side, and the pain will be pale, cold sweat, vomiting, blood in the urine and so on. If it is a urinary tract infection, in addition to localized pain in the lower back, it will be accompanied by frequent urination, urinary urgency, urinary pain, or some patients will also have fever.