There are many causes of low back pain in children, and those with mild symptoms may be untreated, while those with severe symptoms must be diagnosed and treated early. Therefore, we should pay attention to the following situations: 1. age Infection and tumor are more likely to be considered in children under 4 years of age; intervertebral discitis or vertebral osteomyelitis are more frequent in school-age children under 10 years of age, and benign tumors such as eosinophilic granuloma and malignant tumors such as leukemia and neuroblastoma should also be alerted. the most common cause over 10 years of age is excessive exercise, and hunchback and spinal slippage are more likely. 2. nature Acute sudden onset low back pain is mostly related to trauma; chronic mostly spinal deformity, tumor and other possible; transient back pain may muscle strain and other causes, persistent pain should be noted vertebral tumor or infection may (tuberculosis, osteomyelitis, etc.) 3. complications symptoms If accompanied by general discomfort, such as fever, chills, anorexia, lack of weight gain, anemia, etc.. If there is leukemia, there will be low back pain at the beginning. Inflammation of the vertebral body will also have systemic symptoms, so detailed inquiries and examinations must be made according to the condition. Common diseases 1. Acute onset of muscle strain Most often seen in school-age children, normal nervous system, pain does not spread to other parts of the body, treatment should pay attention to rest, local ice, 2 days after the hot compress, such as pain for more than 2 weeks should be photographed to exclude the possibility of bone disease. 2.Hunchback with rounded posterior projection of the back, the spine cannot be straightened, and the painful area is between the two scapulae. The pain is worse when sitting, standing and moving for a long time, but the pain is milder in normal times. X-rays can help to identify this condition. Surgery should be considered for posterior protrusion over 70 degrees. 3, idiopathic scoliosis about 1/3 of the children may have pain symptoms in the early stage, scoliosis below 30 degrees brace treatment, 45 degrees or more surgery. 4, spinal tuberculosis Most often occurs at the junction of the thoracolumbar spine, with an angular hump. There are low fever, loss of appetite, positive family history, positive skin test, increased blood sedimentation and primary foci seen in chest X-ray. Low back pain is mild, and in severe cases, lower limb paralysis may occur. Treatment requires oral anti-tuberculosis drugs and increased nutrition; surgery in severe cases. 5, vertebral osteomyelitis 1-5 years old is more frequent, manifesting with low back pain or abdominal pain,, limping. Half of the patients have fever, positive pick-up test, and effective for antibiotic treatment. 6, tumors Benign tumors and tumor-like tumors include osteoid osteoma, osteoblastoma, eosinophilic granuloma and aneurysm-like bone cysts. Malignant tumors include leukemia, osteosarcoma, and possibly metastases. Most of them require surgery or chemotherapy. Therefore, parents of children with low back pain whose cause is not clear should pay enough attention to it and seek medical consultation and examination from a specialist as soon as possible to clarify the condition and provide early treatment.