A CESI, or cervical epidural steroid injection, is a minimally invasive procedure that delivers anti-inflammatory medication into the space surrounding the spinal nerves in your neck. It’s used to manage neck pain, arm pain, and numbness caused by compressed or irritated nerves in the cervical spine. The procedure typically takes 15 to 30 minutes and is performed as an outpatient visit, meaning you go home the same day.
Why a CESI Is Performed
The injection targets inflammation around the nerve roots in your cervical spine. When a disc herniates, bone spurs develop, or the spinal canal narrows, the resulting pressure on nearby nerves triggers swelling and pain that can radiate down into your shoulders, arms, and hands. The steroid medication delivered during a CESI reduces that inflammation, which in turn lowers the pain signals those nerves are sending.
The most common conditions treated with a CESI include herniated discs in the neck, cervical spinal stenosis (narrowing of the spinal canal), degenerative disc disease, and radiculopathy, which is the medical term for pain, tingling, or weakness that travels along a nerve path from the neck into the arm. Most people who get a CESI have already tried conservative treatments like physical therapy, oral anti-inflammatory medications, or rest without enough improvement.
How the Injection Is Done
There are two main approaches a physician can use: interlaminar and transforaminal. The approach chosen depends on where your pain originates and the anatomy of your spine.
With the interlaminar approach, you lie face down with your neck gently flexed forward. The needle enters through the midline of the back of your neck, passing between the bony arches of two vertebrae to reach the epidural space. This approach is typically performed at the lower cervical levels (C6-C7 or C7-T1) because the epidural space is wider there, making the procedure safer.
With the transforaminal approach, you lie face up with your head turned away from the painful side. The needle is guided into the small opening (foramen) where the affected nerve exits the spine. This allows the medication to be delivered closer to the specific nerve root causing your symptoms.
Both approaches use real-time imaging, either fluoroscopy (a type of live X-ray) or CT guidance, so the physician can see exactly where the needle is at all times. Before the needle reaches its target, a small amount of contrast dye is injected to confirm proper placement. The area is numbed with a local anesthetic before the spinal needle is inserted, so the procedure itself is uncomfortable but not typically described as severely painful.
What Recovery Looks Like
Most people can return to their normal routine within a day or two, though you may want to take it easy initially. If the injection included a numbing agent, you might feel immediate but temporary relief that wears off within hours. Your neck or arm may actually feel more sore for the first few days before improvement kicks in.
The steroid component typically starts working within one to five days. Pain relief builds gradually as the inflammation around the nerve root decreases. How long the relief lasts varies considerably from person to person, ranging from weeks to several months.
How Well It Works
Success with cervical epidural injections is generally measured by whether you achieve at least a 50% reduction in pain compared to your baseline. For cervical transforaminal injections used to treat nerve-related pain, roughly half of patients reach that threshold at short and intermediate follow-up periods. These numbers mean a CESI won’t eliminate pain for everyone, but for those who respond well, the relief can be meaningful enough to participate in physical therapy and daily activities that were previously too painful.
If the first injection provides significant improvement, a repeat injection may be appropriate when the pain returns. Clinical guidelines from the American Society of Interventional Pain Physicians cap the frequency at a maximum of four injections per year in the cervical region. Medicare and other insurers generally require documentation of at least 50% sustained improvement in pain or function lasting at least three months before approving additional injections.
Risks to Be Aware Of
Most CESIs are completed without complications. Common, mild side effects include temporary soreness at the injection site, a brief increase in pain, and occasionally a mild headache. Some people experience temporary flushing, elevated blood sugar (relevant if you have diabetes), or trouble sleeping for a night or two after the steroid is injected.
Serious complications are rare but worth understanding because the cervical spine sits close to critical structures. The most significant risks include accidental puncture of the membrane surrounding the spinal cord, epidural hematoma (a blood collection that can compress the spinal cord), infection, and in very rare cases, injection of medication into the spinal cord itself or into a blood vessel supplying the brain. These worst-case scenarios, including paralysis and stroke, have been documented in medical literature but remain uncommon, particularly when the procedure is performed under imaging guidance by an experienced physician.
The use of real-time fluoroscopy or CT guidance has become standard specifically to minimize these risks. Contrast dye confirmation before delivering the steroid adds another safety layer by ensuring the needle tip is in the correct location.
How to Prepare
Your provider will likely ask you to stop taking blood-thinning medications for a set number of days before the procedure, since even minor bleeding in the epidural space can cause problems. You may also be asked to fast for several hours beforehand, particularly if sedation will be used. Bring a list of your current medications, and arrange for someone to drive you home, as mild numbness or grogginess after the procedure can make driving unsafe.