Inexplicable lumbar pain, the following reasons are common: First, lumbar muscle strain: it is a chronic cumulative lumbar muscle injury, so the patient does not have obvious signs that can produce lumbar sudden pain, lumbar muscle stiffness and lumbar spine activity is limited. Its clinical symptoms are mainly soreness and swelling, and the pain symptoms will be significantly reduced when pressed, and bed rest can also relieve the pain. Second, lumbar disc herniation: it is also a chronic cumulative disease, especially for the elderly patients, if the patient is overworked recently, there may be a lumbar pain symptom when waking up in the morning on a certain day, accompanied by lumbar spine activity limitation, and when it is serious, it can involve one side of the lower limbs, and even lower limb limp, and it can be detected through the CT or MRI examination. If patients have inexplicable back pain, they should also seek early medical attention.