The occurrence of left lumbar side pain is mostly caused by cold. Due to cold stimulation, symptoms of left lumbar side pain may occur, and in severe cases, it may be impossible to bend over. It is recommended to pay attention to keeping warm in daily life, and symptoms can be improved by acupuncture and red light for severe pain. In addition, injuries to local muscles, soft tissues and bones, as well as diseases such as lumbar disc herniation, left-sided kidney or ureteral stones, can also cause pain in the left lumbar side. For women, it can also be seen in gynecological diseases. If the pain is more severe, prompt medical attention should be sought. In addition to life factors, commonly in the following diseases: a. Lumbar spine diseases: 1, strain: poor posture when engaged in physical labor, or long-term maintenance of the same posture, may lead to left lumbar muscle strain or joint soft tissue, ligaments and other chronic injury, may cause left lumbar side pain; 2, trauma: such as acute lumbar sprain, vertebral fracture, spinal dislocation, etc., mostly due to strenuous activity, accidental sprain and impact, etc. Resulting in, lumbar muscles, soft tissues and bone damage, can cause left lumbar side pain; 3, lumbar disc herniation: with age, lumbar disc degenerative changes, or lumbar bear too much pressure caused by injury, as well as by genetics, pregnancy, lumbosacral congenital malformation and other factors, can lead to lumbar disc herniation. Patients often show pain on one or both sides of the lumbar region, which can be accompanied by radioactive pain, numbness and weakness of the lower limbs, affecting patients’ walking and lumbar activities; 4, lumbar spine tumor: if the growth site is located in the left side of the lumbar spine, with the growth of the tumor so that the bone is destroyed, the nerves around the periosteum are stimulated, which can produce the phenomenon of pain on the left side of the lumbar region. Second, urinary system diseases: because the left kidney, the left ureter adjacent to the left side of the waist, when the lesion occurs patients can appear pain performance, such as left kidney nephritis, left kidney and ureteral stones, renal tuberculosis, etc., lumbar pain is mostly colic, but also accompanied by symptoms such as hematuria, nausea, vomiting, or increased blood pressure, urinary frequency, urinary urgency, urinary pain and other performance, if the above symptoms exist, it is recommended to seek medical treatment in a timely manner to To prevent secondary infection. Gynecological diseases: If the patient is female, dysmenorrhea, pelvic inflammatory disease or ovarian cyst torsion may also cause low back pain, but usually combined with abdominal pain, it is recommended to seek medical attention when the symptoms are serious and early treatment.