Corticosteroids, the anti-inflammatory drugs prescribed for conditions ranging from asthma to autoimmune disease, can trigger tremors and involuntary shaking in some people. The shaking is rarely dramatic enough to be called “uncontrollable” in the clinical sense, but it can be persistent, unsettling, and hard to predict. The pathways behind it are more varied than most patients expect, involving everything from direct effects on brain signaling to shifts in blood chemistry that make muscles behave erratically.
How Corticosteroids Stir Up the Nervous System
Corticosteroids are synthetic versions of cortisol, a hormone the adrenal glands produce in response to stress. Because cortisol receptors sit on cells throughout the body and brain, flooding the system with a high-dose synthetic version sends ripples well beyond the inflammation being treated. One of the most relevant effects for tremor involves the brain’s balance between excitatory and inhibitory signaling. Glucocorticoids regulate the glutamatergic system, which is the brain’s primary excitatory network. They do this both by acting directly on receptors at glutamatergic synapses and through indirect hormonal cascades involving the hypothalamic-pituitary-adrenal axis. When glucocorticoid levels are artificially elevated by medication, this balance can tip toward excessive excitation, creating conditions in which tremor, agitation, and muscle hyperactivity become more likely.1Journal of Evolutionary Biochemistry and Physiology. Neuroendocrine Control of Hyperglutamatergic States in Brain Pathologies: the Effects of Glucocorticoids
This excitatory shift also helps explain other common neuropsychiatric side effects of steroid therapy, including insomnia, anxiety, and a jittery or “wired” feeling that patients often describe as being unable to sit still. The tremor that accompanies these symptoms is typically a fine, rapid shaking of the hands that worsens when the arms are held outstretched. It resembles the exaggerated physiological tremor you might get from too much caffeine, which makes sense because the underlying mechanism is similar: the nervous system’s accelerator pedal is being pushed harder than usual.
Potassium Depletion and Its Role in Shaking
A less obvious but sometimes more serious route to steroid-related shaking runs through the kidneys. Glucocorticoids can activate mineralocorticoid receptors in the kidney, prompting the body to retain sodium and excrete potassium. The result is hypokalemia, or abnormally low potassium in the blood, and potassium is essential for normal muscle contraction. When levels drop, muscles can cramp, twitch, feel weak, or shake involuntarily. In severe cases, the consequences extend to the heart, where dangerously low potassium can provoke life-threatening rhythm disturbances.
A case report illustrates how quickly this can happen. A 35-year-old man developed five days of progressive weakness after starting a prednisone taper at 50 mg alongside a topical corticosteroid cream. His serum potassium dropped to 1.9 mmol/L, which is far below the normal range of roughly 3.5 to 5.0. The combination of systemic and extensive topical steroid use compounded the potassium loss, and even the topical cream contributed through absorption into the bloodstream.2PubMed Central. Severe Hypokalemia After Corticosteroid Use: A Case of Steroid-Induced Potassium Depletion This is an extreme example, but milder drops in potassium are common during steroid courses and can produce the kind of tremulousness or muscle twitching that patients describe as shaking.
If you are on corticosteroids and notice shaking alongside muscle weakness, cramps, or an irregular heartbeat, the electrolyte angle is worth raising with your doctor. A simple blood test can check potassium levels, and supplementation or dietary adjustments can often correct the problem without changing your steroid prescription.
Blood Sugar Swings
Steroids are well known for raising blood glucose. They do this by increasing glucose production in the liver and reducing the ability of cells to take up sugar from the blood. In people with diabetes, the spike can be substantial. A study of patients receiving steroid injections for musculoskeletal pain found that blood glucose rose significantly the day after injection, particularly in those whose diabetes was already poorly controlled before the shot.3PubMed Central. Changes in Blood Glucose Level After Steroid Injection for Musculoskeletal Pain in Patients With Diabetes In those taking insulin, the post-injection glucose spike was also greater than in people managing their diabetes through other means.
You might wonder why a rise in blood sugar would cause shaking, since tremor is more classically associated with low blood sugar. Here is where the picture gets slightly complicated. Steroid-driven hyperglycemia itself does not directly cause tremor, but the body’s response to it can. If a person with diabetes compensates by increasing their insulin dose, they may overshoot and end up temporarily hypoglycemic, and low blood sugar very reliably produces shaking, sweating, and a feeling of weakness. Even in people without diabetes, the rollercoaster of glucose surges followed by insulin overcompensation can contribute to intermittent tremulousness during a steroid course. This is one reason shaking on steroids tends to come and go rather than remain constant.
When the Shaking Actually Comes from a Partner Drug
One of the most common scenarios in which patients blame steroids for shaking involves a case of mistaken identity. Corticosteroids are frequently prescribed alongside other medications, and some of those co-medications are far more likely to cause tremor than the steroid itself. The clearest example is in respiratory medicine, where inhaled corticosteroids are almost always paired with long-acting beta-agonist bronchodilators for asthma and chronic obstructive pulmonary disease.
A study of patients on inhaled steroid and beta-agonist combination therapy found that the side effects broke down along surprisingly clean lines. About 83% of patients reported side effects they attributed to the inhaled corticosteroid, and those were dominated by sore throat and dry throat. Meanwhile, about 72% reported side effects from the beta-agonist component, and the most frequent of those were muscle cramps, reported by 62%, and muscle twisting, reported by 39%.4ScienceDirect. Potential side effects in patients treated with inhaled corticosteroids and long-acting beta2-agonists The occurrence of these muscle-related side effects increased with higher doses of the beta-agonist. In other words, the “shaking from my steroid inhaler” that many asthma patients describe is often caused by the bronchodilator in the combination, not the corticosteroid.
Beta-agonists cause tremor by stimulating beta-2 adrenergic receptors on skeletal muscle, which increases the rate of muscle fiber firing. This is a pharmacologically distinct mechanism from anything corticosteroids do, yet patients understandably lump the two drugs together when they come in the same inhaler. If you experience tremor on a combination inhaler, asking your doctor whether a formulation with a different beta-agonist or a lower beta-agonist dose might help is a reasonable first step.
Steroid Withdrawal Tremor
Shaking that appears when steroids are reduced or stopped is a different phenomenon from shaking that occurs during active treatment. After weeks or months on corticosteroids, the adrenal glands partially shut down their own cortisol production because the body has been getting synthetic cortisol from outside. When the drug is tapered, there is a window in which cortisol levels are too low before the adrenals fully wake up again. This state, sometimes called adrenal insufficiency or steroid withdrawal syndrome, can produce a constellation of symptoms including fatigue, body aches, nausea, and tremor.
The shaking in withdrawal is driven by a different set of mechanisms than the shaking during active use. Without adequate cortisol, blood pressure can drop, blood sugar can dip, and the autonomic nervous system becomes less stable. All of these contribute to tremulousness. This is why tapering protocols exist: gradually reducing the dose gives the adrenal glands time to ramp back up. Stopping a steroid course abruptly after prolonged use is one of the most reliable ways to provoke withdrawal symptoms, and tremor is among them.
The risk of withdrawal tremor scales with how long you were on the drug and how high the dose was. Someone who took a five-day burst of prednisone for a sinus infection is unlikely to experience meaningful adrenal suppression. Someone who has been on 20 mg daily for six months almost certainly will. There is no sharp cutoff; the degree of suppression varies by individual. But as a rule, any course lasting more than about three weeks at a meaningful dose warrants a taper rather than an abrupt stop.
Distinguishing Steroid-Related Tremor from Other Causes
A key question for anyone who starts shaking while on steroids is whether the steroid is actually causing it. Drug-induced tremor is one of the most common forms of postural tremor, but it sits alongside physiological tremor and essential tremor as leading causes.5Oxford Academic. A practical guide to the differential diagnosis of tremor Essential tremor, which affects millions of people and typically involves a rhythmic shaking of the hands during voluntary movement, often shows up for the first time in middle age, which is also the demographic most likely to be on a steroid prescription for arthritis or autoimmune disease. The timing can make it look like the steroid caused a tremor that was actually already developing independently.
There are also metabolic causes to consider. An overactive thyroid, for instance, produces a fine postural tremor that looks nearly identical to steroid-induced tremor. Thyrotoxicosis should be considered in any recent-onset postural tremor, particularly because corticosteroid therapy itself can occasionally mask or alter thyroid function tests, complicating the picture further.5Oxford Academic. A practical guide to the differential diagnosis of tremor
A few features can help sort out the cause. Steroid-induced tremor tends to:
- Track the dose: it appears or worsens when the dose goes up and eases when it comes down.
- Resolve after discontinuation: if the tremor persists weeks after the steroid has been fully tapered and cleared, something else is likely responsible.
- Accompany other steroid side effects: insomnia, mood changes, increased appetite, and elevated blood sugar occurring alongside the tremor point toward the steroid as the shared cause.
If the tremor does not follow any of these patterns, it is worth investigating other explanations rather than assuming the steroid is at fault.
Anabolic Steroids and Shaking
When people search for whether “steroids” cause shaking, they sometimes mean anabolic-androgenic steroids, the testosterone-based compounds used in bodybuilding and performance enhancement, rather than corticosteroids. The two drug classes share a name but have largely separate side-effect profiles. Anabolic steroids are less commonly associated with tremor during use, though they can cause it indirectly. High-dose testosterone and its derivatives raise blood pressure, alter cholesterol, and affect the cardiovascular system in ways that can occasionally produce palpitations and a sense of internal tremulousness. The more direct route to shaking with anabolic steroids comes after stopping them: suppression of the body’s natural testosterone production during a cycle means that cessation can lead to a hormonal crash. Low testosterone, low cortisol (since the hypothalamic-pituitary axis is broadly suppressed), and the psychological distress of withdrawal can all contribute to tremor-like symptoms in the post-cycle period.
The practical distinction matters because the management is entirely different. Someone experiencing tremor on prescribed corticosteroids should talk to the prescribing doctor about dose adjustments, electrolyte monitoring, or taper strategies. Someone experiencing tremor after an anabolic steroid cycle may need hormonal evaluation and potentially a supervised recovery protocol. Lumping the two drug classes together under “steroids” leads to confusion in both directions.
Who Is More Susceptible
Not everyone on the same steroid dose develops tremor, and individual susceptibility varies considerably. Several factors increase the likelihood:
- Pre-existing tremor: people with essential tremor or a family history of it often find that steroids amplify what was previously a barely noticeable shake.
- Caffeine and stimulant use: both caffeine and corticosteroids push the nervous system toward greater excitability through overlapping pathways, so heavy coffee drinkers may notice more tremor on steroids than people who consume little caffeine.
- Age: older adults tend to have lower baseline potassium, less metabolic reserve, and greater sensitivity to disruptions of the hypothalamic-pituitary-adrenal axis, all of which make steroid-related tremor more likely.
- Polypharmacy: the more medications you take alongside a steroid, the higher the chance that a drug interaction amplifies tremor. Beta-agonists, certain antidepressants, lithium, and thyroid hormones are all known to cause or worsen tremor on their own, and adding a corticosteroid into the mix raises the odds.
- Diabetes: as discussed earlier, the glucose instability caused by steroids is more pronounced in people with pre-existing blood sugar issues, creating a wider swing between high and low glucose states and, consequently, more episodes of hypoglycemic tremor.3PubMed Central. Changes in Blood Glucose Level After Steroid Injection for Musculoskeletal Pain in Patients With Diabetes
None of these factors makes steroid use impossible; they simply mean closer monitoring is warranted. Knowing that you are in a higher-risk group gives you and your doctor a head start on watching for electrolyte shifts, adjusting co-medications, or choosing a lower initial dose when the clinical situation allows it.
Practical Steps If You Are Shaking on Steroids
The first and most important step is not to stop the medication abruptly. Cutting off a steroid without a taper can cause adrenal crisis, which is a medical emergency. Instead, contact the prescribing clinician and describe what you are experiencing: when the shaking started relative to the steroid course, whether it is constant or intermittent, and whether it is getting worse.
While waiting for medical advice, a few common-sense measures can help. Staying hydrated and eating potassium-rich foods such as bananas, potatoes, and leafy greens supports electrolyte balance. Cutting back on caffeine removes one overlapping source of nervous-system stimulation. Monitoring blood sugar more frequently if you have diabetes helps catch the glucose swings that contribute to tremulousness. Keeping a brief log of when the shaking occurs, its severity, and what you were doing at the time gives your doctor useful information for deciding whether a dose adjustment, a potassium supplement, or a switch to a different steroid formulation is the right move.
For most people, steroid-related tremor is a nuisance rather than a danger. It tends to be dose-dependent and reversible. But because it can occasionally signal something more serious, like significant hypokalemia or an emerging adrenal crisis during a taper, treating it as a symptom worth reporting rather than simply tolerating is the safer approach.