A cortisone shot can help a pinched nerve, and for many people it provides meaningful relief. In studies of cervical (neck) nerve compression, about 41% of patients experienced excellent pain relief lasting six months, and another 29% had good relief lasting at least six weeks. The results aren’t guaranteed, but cortisone injections are one of the most common and effective non-surgical treatments for nerve compression in the spine, wrist, and other areas.
How Cortisone Relieves a Pinched Nerve
A pinched nerve happens when surrounding tissue, often a bulging disc or swollen ligament, presses against a nerve root. That pressure triggers inflammation, which makes the swelling worse and amplifies pain signals. Cortisone is a powerful anti-inflammatory steroid. When injected near the compressed nerve, it shrinks the inflamed tissue and opens up the narrow passage where the nerve is being squeezed. The nerve itself isn’t “fixed,” but reducing the swelling around it can be enough to stop the pain, numbness, or tingling.
Most injections also include a numbing agent that provides immediate but temporary relief. The cortisone itself takes longer to kick in. You can expect a short-term flare of pain and irritation for up to two days after the shot. After that, the anti-inflammatory effect builds, and most people notice improvement within a few days to two weeks.
How Long the Relief Lasts
When a cortisone shot works, the relief typically lasts three to six months, sometimes longer. That window gives your body time to heal on its own, since many pinched nerves resolve as disc bulges shrink or inflammation subsides naturally. For some people, a single injection is all they need. Others find the pain returns and may benefit from a repeat injection.
Current guidelines recommend waiting at least three months between cortisone injections in the same area. Repeated shots over a short period can weaken nearby tissue, so doctors generally limit the number you receive in a given year.
Success Rates by Location
Where the pinched nerve is located affects how well a cortisone shot works.
Neck and Back (Spinal Nerves)
For pinched nerves in the cervical spine (neck), a study of 58 patients found that about 70% experienced at least good relief: 41% had excellent results with 90% or more pain reduction at six months, and 29% had more than 50% pain reduction lasting six weeks or longer. The remaining 29% had poor results. Lumbar (lower back) nerve compression responds at similar rates, though results vary depending on the severity and cause of compression.
These injections are delivered as epidural steroid injections, meaning the medication is placed into the space surrounding the spinal cord and nerve roots. Imaging guidance helps the doctor place the needle precisely.
Wrist (Carpal Tunnel Syndrome)
Carpal tunnel syndrome is a pinched median nerve in the wrist, and cortisone injections are a standard first-line treatment before surgery is considered. About 32% of patients in a large study with over seven years of follow-up never needed any further treatment after a single injection. However, the majority (68%) eventually required either another injection or surgery. Among those who did need more treatment, 63% ultimately had surgery. The median time before a single injection “failed” was about 8.5 months.
Cortisone works best for carpal tunnel when symptoms are mild to moderate. If you have significant muscle weakness or constant numbness, the injection is less likely to provide lasting benefit.
Cortisone as a Diagnostic Tool
Sometimes the injection serves a dual purpose. Doctors use selective nerve root blocks, where a numbing agent is injected at a specific nerve level, to confirm which nerve is actually causing your pain. If your pain drops by 70% or more within 30 minutes, that helps pinpoint the problem nerve. This technique has an accuracy of about 73% and is especially useful when imaging shows problems at multiple levels but the doctor needs to identify the one driving your symptoms.
Side Effects to Expect
Cortisone shots are generally low-risk compared to surgery, but they do carry side effects. The most common is a post-injection flare: a temporary increase in pain, swelling, and irritation that typically lasts one to two days. Applying ice and resting usually manages this.
Less common local side effects include skin lightening at the injection site, thinning of nearby tissue, and, rarely, infection. On the systemic side, cortisone can cause a temporary spike in blood sugar (relevant if you have diabetes), facial flushing, and a brief increase in blood pressure. Repeated injections over time carry a small risk of weakening bone density in the area. These systemic effects are usually mild and short-lived because the dose is relatively small and localized.
How Cortisone Compares to Surgery
For most pinched nerves, cortisone injections are tried before surgery. The evidence comparing the two directly is limited because few studies have put patients through both treatments in a head-to-head trial. However, reviews of available data suggest that pain improvement rates are broadly similar: both surgical and injection patients tend to report at least 40% improvement in pain scores.
The key difference is in complications. Surgical patients face risks including infection, hardware problems, scarring that requires additional procedures, and in spinal fusion cases, nonunion rates of roughly 8% to 41%. Injection complications are significantly less common and less severe. Return-to-work rates are also comparable, with over 40% of patients in both groups resuming work at follow-up.
For carpal tunnel specifically, the pattern is clearer. A cortisone shot buys time and works well for milder cases, but about two-thirds of patients eventually need surgery over the long term. Surgery tends to be more definitive for severe or persistent compression.
Who Benefits Most
Cortisone shots work best when inflammation is a major part of the problem. If your pinched nerve is caused by a disc herniation with significant swelling, or by soft tissue inflammation compressing a nerve, the shot has a good chance of helping. People with recent-onset symptoms (weeks to a few months) tend to respond better than those with chronic, long-standing compression.
The shot is less effective when the compression is purely structural, such as a bone spur physically narrowing the nerve canal with little surrounding inflammation. In those cases, reducing swelling won’t relieve the mechanical pressure, and surgery may be a more appropriate option. Your doctor can usually determine this from an MRI or CT scan before recommending the injection.