The patient has the following symptoms, indicating that the back may flash to: 1, there will be a sharp pain on one side of the waist. This pain will make the patient feel very uncomfortable, whether standing or sitting, or step walking, will cause severe pain. Only when lying down, can feel the pain has a slight relief. 2, there will be obvious activity limitations. Patients with acute lumbar sprain will often cover their waist with their hands and dare not step forward nor sit down. At this time will be forced to remain in a half-bent position. 3, there will be localized obvious swelling and spasm of the muscle strips. When touching the painful part of the waist, firstly, you will feel a very obvious pain point, and then you may feel the spasm of muscle strips or diffuse swelling in the localized area. The presence of these symptoms indicates that the patient may have a sprained lower back. In addition to this, the patient needs to carefully recall that there should have been a history of pain in the lower back with sudden force prior to this.