Epidural steroid injections are used to treat pain that comes from irritated or inflamed nerves in the spine, often causing neck, back, or leg pain (such as sciatica). A steroid medication is injected into the epidural space around the spinal nerves to reduce inflammation and swelling, which helps relieve pain and improve movement. The procedure is usually done with X-ray guidance to ensure accurate placement. Relief may last from weeks to months and can allow patients to participate more comfortably in physical therapy and daily activities.