Low back pain in 14 year olds is firstly caused by local trauma, if the child’s lower back is hit by external force, this will cause traumatic low back pain. Secondly, it is caused by kidney stones, which can cause severe pain in the lower back, and can be diagnosed by an ultrasound examination of the urinary tract. In addition, it is caused by children’s sedentary lifestyle. Children with heavy schooling tend to sit on the bench for long periods of time to study, which can also cause lumbar muscle strain and cause back pain.