Pain, numbness. Facet joint injections are often done in the lumbar & cervical spine, often under fluoroscopy (live x-ray), bathing this joint with an anesthetic (lidocaine, etc.) and steroid/cortisone. Common side effects include pain (during and for the first 48 hours), numbness (often temporary) and bleeding (usually minimal). Rare & serious side effects include infection, nerve injury and spinal fluid leak.