How Often Can I Get Cortisone Shots in My Shoulder?

Most orthopedic surgeons and sports-medicine physicians cap cortisone shoulder injections at three to four per joint per year, spaced at least three months apart. That guideline is not pulled from a single landmark trial but from decades of accumulated evidence showing that corticosteroids can damage cartilage and weaken tendons in a dose-dependent way. The real answer, though, is more nuanced than a flat number, because the right frequency depends on which shoulder condition you have, how you respond to each shot, and whether surgery might be in your future.

Why There Is a Cap at All

Cortisone is a powerful anti-inflammatory, and a single well-placed injection can quiet a flaring shoulder for weeks or months. The trouble is what happens to the tissues that absorb the drug over time. A review of corticosteroid effects on cartilage found that the damage is clearly dose-dependent: at low cumulative doses, corticosteroids can actually promote cell recovery, but once you cross into higher cumulative territory, researchers observed significant cartilage breakdown and cell death in both lab and animal models.¹ That dose threshold is the biological reason behind the spacing rule: spreading injections out gives the tissue time to recover rather than stacking insults on top of each other.

Tendons face a separate risk. A cohort study using a large clinical database found that patients who received steroid injections in the shoulder had a roughly seven-fold higher risk of rotator cuff tendon tears compared to those who did not receive injections.² That does not mean a single injection will snap your rotator cuff, but it does mean that repeated shots weaken the collagen structure over time. If your shoulder problem is already tendon-related, your doctor may be more conservative with how many injections they offer.

What Cortisone Shots Actually Help With in the Shoulder

Not every shoulder condition responds the same way, and how often you might need a repeat injection depends partly on what is being treated.

Subacromial Bursitis and Impingement

This is the classic reason people get a cortisone shot in the shoulder: inflammation of the bursa or impingement of the rotator cuff tendons under the bony arch of the shoulder blade. Injecting corticosteroid into the subacromial space reliably reduces pain scores, and studies show meaningful improvement in both pain and range of motion after one or two injections.³ However, a randomized trial comparing subacromial cortisone injections with manual physical therapy found that by one year, both groups had improved by about 50 percent on a standard shoulder-disability scale, with no meaningful difference between them.⁴ The shot works faster; physical therapy catches up. That matters when you are deciding whether to get a second or third injection or whether to invest the time in rehab instead.

Frozen Shoulder

Adhesive capsulitis, commonly called frozen shoulder, involves progressive stiffness as the joint capsule tightens and inflames. A systematic review of randomized trials found that corticosteroid injections outperform both placebo and physiotherapy in the short term, especially in the early painful phase before significant stiffness has set in.⁵ Because frozen shoulder tends to progress through stages over months, some patients receive two or three spaced injections to stay ahead of the inflammation while they work on regaining movement. Ultrasound-guided injections directly into the glenohumeral joint have shown strong results: in one study, more than half of patients reported greater than 75 percent pain relief within three months, and pain scores continued to improve through about ten months of follow-up.⁶

After Shoulder Surgery

Sometimes cortisone injections are used during recovery from shoulder surgery to manage stiffness or persistent pain that is limiting rehabilitation. A retrospective study of 945 shoulder surgeries found that about 22 percent of patients received a cortisone injection within six months of their operation, typically around three months post-surgery. Nearly 95 percent of those patients reported at least mild-to-moderate improvement in pain and function within four to six weeks, and a quarter of them needed a second injection during the study period.⁷ In this context, the injection is used as a window-opener for physical therapy rather than as a standalone fix.

Blood Sugar Spikes If You Have Diabetes

One of the most underappreciated side effects of cortisone injections is what they do to blood glucose. Corticosteroids promote insulin resistance throughout the body, not just at the injection site. If you have diabetes, this matters a lot when deciding how many injections to get and how to time them.

A study specifically looking at shoulder injections in patients with type 2 diabetes found that average glucose jumped from about 136 mg/dL before the shot to 159 mg/dL the next day and 154 mg/dL on day two, returning to baseline by day three.⁸ One in five patients in that study spiked above 350 mg/dL in the first three days. A separate study of hand and wrist injections in diabetic patients showed a similar pattern, with fasting glucose elevated on days one and two before settling down, and patients using insulin or with type 1 diabetes showing the biggest jumps.⁹ Patients whose hemoglobin A1c was above 7 percent before the injection experienced a significantly larger glucose spike on day one compared to those with better-controlled diabetes.¹⁰

The practical takeaway: if you have diabetes, a cortisone injection is not off the table, but you and your doctor need a plan. That might mean monitoring your glucose more closely for a few days, adjusting your insulin dosing, or being more conservative about how many total injections you receive in a year. Each shot is a short-term metabolic disruption, and stacking several close together compounds the effect.

The Hidden Problem With the Local Anesthetic

Most cortisone injections are mixed with a local anesthetic like lidocaine or bupivacaine, partly to numb the injection site and partly to dilute the steroid for easier delivery. What many patients do not realize is that the anesthetic itself can be toxic to cartilage cells.

A systematic review of local anesthetic chondrotoxicity found that lidocaine, bupivacaine, ropivacaine, and several other common agents all showed dose- and time-dependent damage to cartilage cells, and that adding corticosteroids to the mix made the damage worse.¹¹ Among the options, ropivacaine at lower concentrations appears to be the least harmful, while bupivacaine at higher concentrations is the most damaging.¹² An animal study confirmed that even a single injection of a local anesthetic combined with a corticosteroid led to significantly lower cartilage cell survival compared to saline controls, with effects persisting for at least seven days.¹³

This is worth knowing because it means the cumulative tissue load from repeated injections is not just about the corticosteroid. The anesthetic mixed in adds its own layer of cartilage stress. If you are getting injections into the glenohumeral joint (as opposed to the subacromial space above it, where there is less cartilage contact), this matters more. You can ask your provider which anesthetic they use and whether a lower concentration or a different agent might be less harmful, especially if you are on your third or fourth injection.

Pairing Injections With Physical Therapy

One of the smartest ways to reduce how many cortisone shots you need is to use each one as an opportunity to get more out of physical therapy. A large randomized trial tested this directly by giving patients with moderate-to-severe shoulder pain a cortisone injection followed by either exercise therapy or no exercise. The group that started supervised exercise shortly after the injection had significantly better pain and disability scores at one week and six weeks compared to the injection-only group. By 24 weeks, though, the advantage had disappeared.¹⁴

The pattern that emerges across studies is consistent: cortisone buys you a pain-free window, and what you do inside that window determines how long the benefit lasts. If you use the injection as a standalone treatment and wait for the pain to creep back, you end up needing another shot. If you use it to aggressively rehab the shoulder during the weeks when it feels good, you may not need the next injection at all. Your physical therapist can take advantage of the reduced inflammation to push your range of motion and strengthen the rotator cuff in ways that would have been too painful before the shot.

Timing Around Surgery

If there is any chance you are headed toward shoulder surgery, the timing of your last cortisone injection becomes critical. Evidence consistently shows that getting a cortisone shot within four weeks of arthroscopic shoulder surgery raises the risk of post-operative infection.¹⁵ A study looking specifically at shoulder arthroscopy found that the risk was greatest when the injection came within two weeks of surgery, still elevated between two and four weeks, and back to normal after one month.¹⁶

So if you are getting a cortisone shot to tide you over while you wait for a surgical date, make sure your surgeon and the provider giving the injection are coordinating. At minimum, you want a full month between the last injection and the operating room. If you are using cortisone to figure out whether you even need surgery, be honest with your surgeon about exactly when your last shot was. Corticosteroids suppress local immune activity, and operating into tissue that is still immunosuppressed raises infection risk that neither of you wants.

When PRP or Other Alternatives Start Making Sense

If you have hit the practical ceiling of three to four cortisone injections in a year and your shoulder is still flaring, platelet-rich plasma (PRP) is the most commonly discussed alternative. PRP uses a concentrated sample of your own blood platelets, which release growth factors that may promote tissue healing rather than simply quieting inflammation.

The evidence is mixed but growing. A comparative study following patients with rotator cuff tendinopathy for up to 18 months found that PRP and cortisone produced similar improvements in pain, function, and range of motion at every time point, with no significant difference between them.¹⁷ A separate trial, however, found that while both PRP and triamcinolone (a common cortisone formulation) improved pain and function at three months, PRP pulled ahead at six months with significantly better pain scores and functional recovery.¹⁸ The appeal of PRP in a repeated-injection scenario is that it does not carry the same cartilage and tendon risks as corticosteroids, so there is no equivalent cumulative toxicity concern driving a hard cap on how many you can receive.

That said, PRP is typically not covered by insurance and can cost several hundred dollars per injection. The evidence base is also younger and less consistent than for cortisone. PRP makes the most practical sense for people whose shoulder problem is tendon-driven (rotator cuff tendinopathy, partial tears) rather than purely inflammatory (bursitis), and who have already used up a reasonable number of cortisone injections without lasting resolution.

What the Injection Actually Feels Like

Fear of the needle keeps some people from getting a shot they could genuinely benefit from, while others breeze through the first one and wonder why they waited. A study comparing patients’ expected pain against their actual experience found that injections into both the glenohumeral joint and the subacromial space were significantly less painful than patients had anticipated.¹⁹ Glenohumeral joint injections (the deeper shot, into the ball-and-socket joint itself) were perceived as more uncomfortable than subacromial injections (the shallower shot, into the space above the rotator cuff), but both came in well under what patients expected.

After the injection, some people experience a “steroid flare,” a temporary increase in pain for a day or two as the crystalline steroid irritates the tissue before the anti-inflammatory effect kicks in. Skin lightening at the injection site and a temporary dimple in the subcutaneous fat can also occur, especially with repeated injections into the same spot. These cosmetic changes are usually mild but can be permanent in some cases. If the idea of visible skin changes concerns you, mention it to your provider, because injection technique and depth can reduce the likelihood.

Ultrasound Guidance and Injection Accuracy

Where exactly the medication lands makes a real difference in both effectiveness and safety. Blind injections, where the provider feels for landmarks and inserts the needle based on anatomy alone, miss the target surprisingly often. The shoulder is a complex joint with multiple potential injection sites: the glenohumeral joint, the subacromial bursa, and the acromioclavicular joint are all common targets, and each requires a different needle path. Ultrasound guidance lets the provider watch the needle enter the correct space in real time.

The practical reason this matters for injection frequency is straightforward: a shot that lands in the right compartment works better and lasts longer, potentially reducing the total number of injections you need over time. If your first injection gave disappointing relief and your provider used a landmark-guided technique, it is worth asking whether the next attempt could be ultrasound-guided before concluding that cortisone “doesn’t work” for your shoulder. Not every clinic offers ultrasound guidance for every injection, but sports-medicine and musculoskeletal radiology practices generally do.