How Long Does Anxiety Last After a Steroid Injection?

Anxiety triggered by a steroid injection typically peaks within the first 24 hours and resolves within about three days for most people. In some cases it can linger for up to a week, particularly when the steroid dose is higher or you have a history of anxiety or other psychiatric conditions. The timeline is closely tied to how the injected corticosteroid is absorbed into your bloodstream and how long it disrupts your body’s own stress-hormone balance.

The Typical Timeline

Research on patients who received epidural steroid injections for back pain found that neuropsychiatric symptoms like restlessness and irritability were most pronounced at the 24-hour mark, especially in people with an existing psychiatric history.¹ A separate study of rheumatology patients who received musculoskeletal corticosteroid injections reported that neuropsychiatric symptoms, including anxiety, typically resolved within three days.²

That three-day window applies to most people, but it is not universal. When researchers checked in with patients again at one week, those who had received injections at two spinal levels (meaning a higher total dose of corticosteroid) were still reporting symptoms.¹ So the realistic range is somewhere between one and seven days, with three days being the rough midpoint for an uncomplicated single injection.

Why a Local Injection Can Affect Your Brain

It seems counterintuitive that a shot in your knee or lower back would cause anxiety. The explanation is that steroid injections are never purely local. Even when a corticosteroid is deposited directly into a joint or the epidural space around the spinal cord, a meaningful portion of the drug enters your general circulation. A review of the evidence on this found considerable individual variability in how much gets absorbed, but confirmed that both joint and epidural injections can produce body-wide effects lasting weeks.³ Case reports have documented urine tests positive for synthetic corticosteroids in patients who had only received local injections, confirming the degree of systemic spread.⁴

Once the synthetic corticosteroid enters the bloodstream, it interacts with stress-hormone receptors throughout the body, including in the brain. Animal research has shown that corticosteroid receptors in the amygdala, a brain region central to fear and anxiety processing, directly mediate anxiety-like behavior when activated by elevated corticosteroid levels. Blocking those receptors in animal models prevented the anxiety response.⁵ The same mechanism likely operates in humans: a flood of synthetic steroid activates the brain’s alarm circuitry, producing feelings of nervousness, restlessness, and unease that have nothing to do with psychological worry and everything to do with neurochemistry.

How Long the Steroid Actually Stays in Your Body

The anxiety timeline maps fairly well onto what happens pharmacologically. One study tracked blood levels of triamcinolone, one of the most commonly used injectable steroids, after facet joint injections. The drug peaked in the blood within 24 hours, which aligns with when most patients report the worst anxiety and restlessness. Its elimination half-life was roughly 213 hours, or about nine days, meaning it takes over a week for just half of the absorbed dose to clear your system.⁶

But the anxiety does not necessarily last as long as the drug stays detectable. The key factor is cortisol suppression. The injected steroid signals your adrenal glands to scale back production of cortisol, your body’s natural stress hormone. In that same triamcinolone study, cortisol levels were suppressed below normal for an average of about four and a half days.⁶ Another study found cortisol dropped significantly by 24 hours after a single joint injection and remained depressed at 72 hours in some patients.⁷ This temporary hormonal disruption creates a window where the brain’s stress circuitry is being artificially pushed in two directions at once: overstimulated by the synthetic steroid and deprived of normal cortisol regulation. Once cortisol production bounces back, the anxiety usually follows suit.

In rare cases, steroid injections can suppress the hormonal axis long enough to cause temporary adrenal insufficiency. One documented case showed that the body’s stress-hormone feedback loop recovered within about two weeks after a single joint injection.⁸ This is an extreme outcome, but it illustrates the outer boundary of how long the hormonal disruption can last.

Who Is More Likely to Experience Post-Injection Anxiety

Not everyone who gets a steroid injection feels anxious afterward. Several factors raise the odds.

Psychiatric history: People with a pre-existing anxiety disorder or other psychiatric condition are substantially more likely to develop restlessness and irritability after an epidural steroid injection. One prospective study found this difference was statistically significant at 24 hours.¹ A separate analysis of rheumatology patients found that a pre-existing anxiety syndrome was markedly more common among those who developed neuropsychiatric symptoms after their injection compared to those who did not.²
Higher steroid dose: Patients who received two-level spinal injections, which deliver roughly double the corticosteroid, were more likely to still have symptoms at the one-week mark.¹ An older review of corticosteroid therapy found that while higher doses raise the risk of psychiatric side effects, they do not appear to change how long those side effects last once they start.⁹
Pre-existing depression and pain levels: Patients with higher baseline depression scores before an epidural steroid injection tended to get less pain relief from the procedure over time, and those with higher anxiety and somatization scores reported greater disability going in. These psychological factors did not predict whether the injection would fail or succeed in an absolute sense, but they correlated with the degree of improvement.¹⁰

Gender has gotten some attention as a possible risk factor. One prospective study found that male patients had more total neuropsychiatric symptoms at the one-week mark after an epidural injection.¹ But another study that tracked anxiety and depression scores specifically after epidural injections found no significant gender differences at any follow-up point.¹¹ The picture is not clear enough to say gender is a reliable predictor.

Epidural Versus Joint Injections

Most of the research on post-injection anxiety has focused on epidural steroid injections for back pain, partly because they tend to involve higher doses and the epidural space allows efficient absorption into the bloodstream. But joint injections are not exempt. Studies have documented significant cortisol suppression after single intra-articular injections, with some patients showing below-normal cortisol levels for up to 72 hours.⁷ A review of locally injected steroids confirmed that both epidural and joint injections can produce systemic effects that persist for weeks, including hormonal disruption, blood sugar spikes, and other complications.³

The anxiety risk is not unique to one injection site. What varies is the degree. Epidural injections typically deliver more steroid and place it in a location where vascular absorption is rapid, so the systemic dose hitting your brain is often higher and faster. A shoulder or knee injection will generally produce milder and shorter-lived mood effects. But if you are predisposed because of a psychiatric history or are especially sensitive to corticosteroids, even a routine joint injection can trigger noticeable anxiety.

When Post-Injection Anxiety Warrants a Call to Your Doctor

Mild restlessness, jitteriness, and trouble sleeping for a day or two after an injection are common enough that most pain specialists consider them a normal, if unpleasant, side effect. The threshold for concern is when symptoms go beyond garden-variety anxiety. A case series documented patients who met formal diagnostic criteria for a substance-induced mood disorder after epidural steroid injections, meaning their mood changes were severe enough to qualify as a clinical psychiatric episode rather than just passing unease.¹² These cases are rare, but they illustrate that a steroid injection can, in uncommon situations, tip into territory that needs professional management.

Contact your doctor if you experience any of the following after a steroid injection:

Anxiety lasting beyond a week: By that point, most steroid-related symptoms should be fading. Persistent or worsening anxiety suggests either an unusually strong hormonal response or another issue.
Severe mood swings or agitation: Extreme irritability, feelings of mania or euphoria followed by crashes, or crying spells that feel out of character go beyond typical post-injection restlessness.
Sleep disruption that does not improve: Insomnia is one of the most common side effects of corticosteroids and it feeds anxiety in a vicious cycle. If you are still unable to sleep well after several days, your doctor may be able to offer short-term help.
Thoughts of self-harm: Steroid-induced psychiatric effects can occasionally include depressive episodes. This is a medical emergency and warrants immediate attention.

Corticosteroid-induced psychiatric effects are recognized across medicine, from high-dose oral prednisone courses for autoimmune disease to injections for joint pain, though they remain underappreciated in routine injection settings.¹³ Bringing up the possibility with your provider before the injection, especially if you have a psychiatric history, can help them adjust the dose, choose a different steroid formulation, or prepare you with a plan for managing symptoms.

What You Can Do in the Meantime

Because the anxiety is chemically driven rather than rooted in a thought pattern, the usual advice for managing worry does not always help. Telling yourself “there’s nothing to worry about” does not change the fact that your amygdala is being stimulated by a flood of synthetic corticosteroid. Still, a few approaches can make the one-to-three-day waiting period more tolerable.

Understanding that the feeling is pharmacological and temporary can reduce the secondary anxiety that sometimes builds on top: the “why am I so anxious about nothing?” spiral. Knowing the cause and the expected timeline puts a ceiling on the uncertainty, which is often the worst part. Light physical activity, if your injection allows it, can help metabolize the steroid and promote better sleep. Avoiding caffeine for a few days is worth considering since your nervous system is already overstimulated. If you take medication for an existing anxiety disorder, do not stop or change it without talking to your doctor, but do let them know what you are experiencing so they can advise whether a temporary adjustment makes sense.

The Insomnia Connection

One of the most underreported features of steroid injections is the sleep disruption that often accompanies them, and it deserves specific mention because of how tightly sleep loss and anxiety feed each other. Corticosteroids suppress melatonin production and shift the normal cortisol rhythm, both of which can make it genuinely difficult to fall or stay asleep for a night or two after an injection. That lost sleep then amplifies the anxiety you are already feeling from the drug itself.

Patients frequently describe this cycle: the steroid makes them restless, the restlessness prevents sleep, the sleep deprivation makes the restlessness worse, and by the second day they feel significantly more anxious than the steroid alone would account for. Recognizing this pattern is useful because it means the anxiety often improves dramatically once you manage even one decent night of sleep. Some physicians will prescribe a short-acting sleep aid for the first night or two after an injection if the patient has had trouble with insomnia from steroids before. If you have experienced this cycle in a previous injection, raising it with your provider before the next one is a practical step.

Prior Steroid Reactions and Future Injections

If you experienced significant anxiety after a steroid injection, the question of what happens next time is a reasonable one. The available research does not suggest that reactions necessarily worsen with repeated injections, but it does not suggest they go away either. The data on dose is informative here: higher corticosteroid doses are linked to a higher risk of psychiatric side effects, but the dose and duration of treatment do not appear to predict the severity or duration of mental disturbances once they occur.⁹ In other words, getting a bigger dose raises the odds of a reaction but does not make any individual reaction worse.

If you reacted to a steroid injection and need another one, there are practical options to discuss with your provider. They may be able to use a lower dose, switch to a different corticosteroid formulation, or space injections further apart. Some patients also find that being prepared for the anxiety, knowing it is coming and having a plan, makes it significantly more manageable the second time around even if the neurochemistry is the same. The difference between unexpected, unexplained anxiety and expected, time-limited anxiety is not trivial, even when the physiological sensation is identical.