If you’ve ever dealt with persistent joint pain, a sports injury, or chronic inflammation, your doctor may have suggested a cortisone shot. But what exactly is in that syringe, and how does it work?
Often viewed as a “quick fix” for pain, cortisone shots are one of the most common orthopedic treatments in the world. Here is a breakdown of what they are, how they work, and what you should expect.
What is a Cortisone Shot?
A cortisone shot is an injection of a synthetic corticosteroid medication. It is designed to mimic cortisol, a hormone naturally produced by your adrenal glands.
Unlike anabolic steroids (the kind used for muscle building), corticosteroids are powerful anti-inflammatory agents. When injected directly into a specific area—such as a joint or tendon—they work to reduce swelling and suppress an overactive immune response, which in turn relieves pain.
What Conditions Do They Treat?
Doctors use cortisone injections to treat a wide range of inflammatory conditions, including:
- Arthritis: Specifically osteoarthritis and rheumatoid arthritis.
- Bursitis: Inflammation of the fluid-filled sacs (bursae) that cushion your joints.
- Tendonitis: Such as tennis elbow or rotator cuff tears.
- Carpal Tunnel Syndrome: Pressure on the median nerve in the wrist.
- Plantar Fasciitis: Severe heel pain caused by inflammation in the foot.
How Does the Procedure Work?
The procedure is usually quick and performed right in the doctor’s office.
- Preparation: The doctor cleans the injection site. They may use a topical numbing spray or a local anesthetic (like lidocaine) to make the needle prick less painful.
- The Injection: Using a fine needle, the doctor injects the corticosteroid. In some cases, they may use an ultrasound or X-ray (fluoroscopy) to ensure the needle is placed perfectly within the joint space.
- Post-Care: You may be asked to rest the area for 24 to 48 hours to allow the medication to settle and begin working.
How Long Does It Take to Work?
A cortisone shot is not an instant painkiller. While the local anesthetic (if used) might provide immediate relief for an hour or two, the actual cortisone typically takes 2 to 7 days to begin reducing inflammation. Once it kicks in, the effects can last anywhere from a few weeks to several months.
Are There Side Effects?
While generally safe, cortisone shots do carry some risks, especially with repeated use.
- Cortisone Flare: Some patients experience a temporary increase in pain for 24–48 hours after the injection.
- Skin Changes: The skin around the injection site may thin or lose pigment (lightening of the skin).
- Blood Sugar Spikes: Diabetics should be cautious, as cortisone can cause a temporary rise in blood glucose levels.
- Tissue Weakening: If administered too frequently in the same spot, cortisone can weaken tendons or soften joint cartilage.
The “Rule of Three”
Because of the risk of tissue damage, most doctors follow a “rule of three.” Generally, it is recommended that you receive no more than three or four cortisone shots in the same joint within a single year.
The Bottom Line
A cortisone shot is a highly effective tool for managing pain and “quieting down” an angry joint. However, it is important to remember that it treats the inflammation, not necessarily the underlying cause of the injury. Often, these shots are most effective when paired with physical therapy to strengthen the area and prevent the pain from returning.
Disclaimer: This article is for informational purposes only and does not constitute medical advice. Always consult with a healthcare professional before starting any new treatment.