For sciatica, X-rays, CT scan and MRI can be done. 1. X-ray: If the sciatica is caused by a fall, an orthopedic radiograph of the pelvis can be taken. X-ray film is a method of examination using the penetrating effect of X-rays. As X-rays pass through the body, bones, muscle tissues and air absorb X-rays differently, so flat images of different shades of gray from black to white are formed. 2. CT: Usually it is the CT of the intervertebral disc, CT examination is a computerized X-ray tomography, which belongs to the strengthened version of X-ray, if you can’t see clearly in the X-ray, you can do CT for further examination, which can not only check the structure of the tissues in layers, but also check whether there are tumors, infections and other diseases locally. 3. MRI: If the sciatica pain is caused by other reasons, such as tumors at the sciatica, especially malignant tumors, in this case, the results of simple X-ray or CT examination may not be obvious, and then you need to undergo MRI examination.