Steroid shots are injections of corticosteroids, powerful anti-inflammatory medications that reduce swelling and calm an overactive immune system. They’re used to treat a wide range of conditions, from arthritic knees and herniated discs to severe asthma flares and allergic reactions. These are not the same as anabolic steroids, which are synthetic testosterone sometimes misused in sports. Corticosteroid injections are a standard medical treatment prescribed by doctors across many specialties.
How Steroid Shots Work
Corticosteroids mimic hormones your body naturally produces in the adrenal glands. When injected, they do two things: reduce inflammation in the targeted area and dial down immune system activity. This makes them useful for conditions where the body’s inflammatory response has become the problem itself, whether that’s a swollen joint, an irritated nerve, or airways tightening during an asthma attack.
Depending on the condition, a steroid shot can be injected directly into a joint, into the space around the spine, into a muscle, or into soft tissue like a tendon or bursa. The location determines how focused or widespread the effects are. A shot into a knee joint mostly stays local. A shot into a muscle enters the bloodstream and works throughout the body.
Joint and Soft Tissue Conditions
The most common reason people get steroid shots is to treat pain and inflammation in a specific joint or soft tissue. Cortisone shots can be injected into nearly any joint in the body: ankles, elbows, hips, knees, shoulders, wrists, spine, and even the small joints of the hands and feet. These injections are frequently used for:
- Inflammatory arthritis like rheumatoid arthritis, psoriatic arthritis, and gout, where the immune system or crystal deposits cause joint swelling
- Osteoarthritis, the wear-and-tear form of arthritis that breaks down joint cartilage over time
- Bursitis, inflammation of the fluid-filled sacs that cushion bones, tendons, and muscles near joints
- Tendinitis, inflammation of the thick cords connecting muscle to bone
- Trigger finger, where a finger gets stuck in a bent position due to tendon sheath inflammation
- Carpal tunnel syndrome, compression of the nerve running through the wrist
Cortisone shots tend to be most effective for inflammatory arthritis, where the primary problem is immune-driven swelling. For osteoarthritis, they can still provide meaningful relief, though the benefit is often shorter-lived since the underlying cartilage damage remains.
Spinal and Nerve Pain
Epidural steroid injections target the space around the spinal cord and nerve roots. These are used when a structural problem in the spine is pressing on or irritating nearby nerves, causing pain that often radiates into the legs or arms. The steroid reduces inflammation around the compressed nerve, which is what generates much of the pain.
Conditions commonly treated with spinal steroid injections include herniated (bulging) discs, spinal stenosis (narrowing of the spinal canal), degenerative disc disease, and lumbar osteoarthritis. The radiating leg pain many people know as sciatica is one of the most frequent reasons for these injections. Spinal stenosis can also cause a condition called neurogenic claudication, where compressed nerves make walking painful or difficult.
Asthma, Allergies, and Systemic Conditions
Not all steroid shots go into a specific joint or tissue. Intramuscular injections deliver corticosteroids into the bloodstream to treat conditions affecting the whole body. Severe asthma attacks are one of the most common reasons. Corticosteroids are a cornerstone of treating moderate to severe asthma flares because they reduce the airway inflammation that causes wheezing, coughing, and difficulty breathing. A single injection into the muscle works about as well as a course of steroid tablets for preventing asthma relapse.
Steroid shots are also used for severe allergic reactions, lupus, vasculitis (inflamed blood vessels), and myositis (inflamed muscles). In these conditions, the immune system is attacking the body’s own tissues, and the steroid’s ability to suppress that immune response is the key benefit.
What the Procedure Feels Like
A typical steroid shot takes only a few minutes. For joint injections, the area is cleaned and sometimes numbed with a local anesthetic before the needle goes in. If the joint is swollen with excess fluid, your provider may drain that fluid first, which itself can relieve some pressure immediately.
Many providers now use ultrasound imaging to guide the needle in real time. This improves accuracy significantly compared to older “blind” injections, where the provider relied on anatomical landmarks and experience alone. Ultrasound-guided injections deliver better pain relief, lower the risk of hitting a blood vessel or nerve, and often require fewer needle attempts. For spinal injections, imaging guidance is standard practice because the anatomy is more complex.
How Quickly They Work
Many people feel some relief almost immediately after a steroid shot, but that initial improvement is usually from the local anesthetic mixed in with the steroid, not the steroid itself. The corticosteroid typically takes a few days to reduce inflammation noticeably, and in some cases it can take a couple of weeks to reach full effect.
How long the relief lasts varies widely. Some people get a few weeks of improvement, others several months. The duration depends on the condition being treated, how severe the inflammation is, and individual factors. Steroid shots are not a permanent fix. They manage symptoms while the underlying condition either heals on its own or is addressed through other treatments like physical therapy or medication changes.
Limits on How Often You Can Get Them
Repeated steroid injections into the same area can damage cartilage and weaken tendons over time. Most providers recommend no more than three injections per year in any single joint, with at least 12 weeks between shots. The general ceiling is six total steroid injections per year across all sites combined.
These aren’t hard rules, and your provider may adjust them based on your situation. But the limits exist because the risks of tissue damage and systemic side effects increase with repeated use.
Side Effects and Risks
Most people tolerate steroid shots well, but they aren’t risk-free. The most common side effect is a temporary pain flare at the injection site, sometimes called a “steroid flare,” which affects less than 1% of people and usually settles within a day or two.
Local Side Effects
Soft tissue thinning (atrophy) and skin lightening at the injection site are possible, particularly with injections close to the skin surface. These occur in fewer than 1% of cases. Tissue thinning typically appears one to four months after the shot and resolves on its own within six to 30 months. People with darker skin have a higher risk of noticeable depigmentation. Infection is extremely rare, estimated at about 1 in 40,000 injections. Tendon weakening and, in very rare cases, tendon rupture are also possible.
Systemic Side Effects
Even a local injection sends a small amount of steroid into the bloodstream. For most people, this is negligible. But if you have diabetes, it’s worth knowing that steroid shots can temporarily raise blood sugar levels for about five days. People who receive many injections over time may face a slightly increased risk of bone thinning (osteoporosis). Temporary facial flushing, fluid retention, and mild blood pressure increases can also occur but are uncommon.