ConditionBones, joints & muscles
Steroid Myopathy
Steroid myopathy is muscle weakness caused by corticosteroid (glucocorticoid) medicines such as prednisone, prednisolone and dexamethasone, or by high natural cortisol in Cushing syndrome. It usually develops gradually over weeks to months and mainly affects the hip and thigh muscles, making it hard to climb stairs or get up from a chair, usually without pain. Muscle enzyme tests are typically normal. Reducing the steroid dose when possible and regular exercise usually lead to recovery over weeks to months.
Also called: Corticosteroid-induced myopathy, glucocorticoid myopathy, steroid-induced muscle weakness
At a glance
- What it is
- Muscle weakness caused by corticosteroids or excess cortisol.
- Typical pattern
- Gradual, painless weakness of hips and thighs, then shoulders.
- Higher risk
- Higher doses, longer use, fluorinated steroids (dexamethasone, triamcinolone), older age, inactivity, cancer.
- Acute form
- Rapid, severe weakness in intensive care with high-dose intravenous steroids.
- Diagnosis
- Clinical; CK usually normal; tests exclude other causes.
- Treatment
- Lowest effective steroid dose, switching to non-fluorinated steroids, exercise and physical therapy.
When to get help
Call 911 or go to the ER
- Weakness affecting breathing or swallowing
- Sudden severe weakness with dark urine (possible muscle breakdown)
See a doctor within a day or two
- Rapidly worsening weakness, falls or inability to stand
- Weakness with muscle pain and a rash, or after starting other medicines
Book a routine appointment
- Difficulty climbing stairs, rising from a chair or lifting arms after weeks or months on steroids
- Muscle weakness in someone with round face, weight gain and purple stretch marks
- Do not stop steroids on your own; discuss any weakness with your prescriber
What happens in steroid myopathy
Glucocorticoids break down muscle protein and reduce new protein production. They mainly affect type 2 (fast-twitch) muscle fibers, which are used for powerful movements such as standing up and climbing. These fibers shrink (atrophy), causing weakness without inflammation or muscle damage, which is why muscle enzymes stay normal.
Two forms
| Chronic steroid myopathy | Acute steroid myopathy | |
|---|---|---|
| Setting | Weeks to months of oral steroids, or Cushing syndrome | High-dose IV steroids, often in intensive care, especially with paralyzing medicines |
| Onset | Gradual | Days |
| Muscles | Hips and thighs, then shoulders | Widespread, including breathing muscles |
| Pain | Usually none | May be present |
| CK enzyme | Normal | May be raised |
| Recovery | Weeks to months after dose reduction | Weeks to months; can be prolonged |
The acute form overlaps with critical illness myopathy.
Causes and risk factors
- dose: risk rises with higher daily doses; often seen with doses equivalent to 10 mg or more of prednisone daily for weeks, though it can occur at lower doses
- duration: longer courses
- type: fluorinated steroids (dexamethasone, betamethasone, triamcinolone) carry higher risk
- Cushing syndrome with high natural cortisol
- older age
- physical inactivity and bed rest
- cancer, lung disease and poor nutrition
- intensive care with high-dose IV steroids and neuromuscular blocking agents
Inhaled and topical steroids rarely cause myopathy.
Symptoms
- difficulty rising from a chair, squatting or getting out of a car
- trouble climbing stairs
- difficulty lifting arms above the head, brushing hair or reaching shelves
- waddling walk
- muscle wasting of thighs and buttocks
- falls
- usually no pain
People taking steroids often also have other side effects: weight gain, a round face, thin skin, high blood sugar and bone thinning.
Diagnosis
Steroid myopathy is a diagnosis of exclusion based on:
- history: steroid use and timing of weakness
- examination: proximal muscle weakness with normal reflexes and sensation
- blood tests: CK usually normal; tests for thyroid function, electrolytes (especially potassium), vitamin D and inflammation
- EMG: often normal or mildly myopathic
- muscle biopsy: rarely needed; shows type 2 fiber atrophy
An important challenge is telling steroid myopathy from a flare of the disease being treated, especially in conditions like polymyositis (inflammatory myopathy), where weakness could mean the disease needs more steroids, not fewer. Raised CK and MRI or EMG signs of inflammation point to disease activity.
Other medicines can also cause muscle problems, such as statins (statin-induced myopathy).
Treatment
- Reduce the dose: taper to the lowest effective dose, or stop if possible, under medical supervision. Never stop long-term steroids abruptly, as this can cause adrenal crisis.
- Switch type: from a fluorinated steroid to prednisone or prednisolone.
- Alternate-day dosing in some situations.
- Steroid-sparing medicines for the underlying disease.
- Exercise: resistance and aerobic training slow and reverse muscle loss; physical therapy helps safe strengthening.
- Nutrition: adequate protein and calories; correct vitamin D and potassium.
- Fall prevention: given the combined risks of weakness and steroid-related osteoporosis.
Outlook
Most people recover strength within weeks to a few months after the steroid dose is reduced, though it can take longer in older or very weak patients. Acute ICU-related myopathy may take months, and recovery can be incomplete.
Prevention
- use the lowest effective steroid dose for the shortest time
- prefer non-fluorinated steroids when possible
- start exercise early during steroid treatment
- maintain good nutrition and protein intake
- monitor for early signs of weakness
Frequently asked questions
Can prednisone cause muscle weakness?
Yes. Prednisone and other corticosteroids can cause steroid myopathy, typically weakness of the hip and thigh muscles that makes it hard to climb stairs or stand from a chair. It is more likely with higher doses and longer courses.
How long does steroid myopathy last?
Strength usually improves within weeks to a few months after the steroid dose is reduced or stopped. Recovery may be slower in older adults, after very high doses, or after intensive care stays.
How is steroid myopathy diagnosed?
It is diagnosed from the history of steroid use and the pattern of weakness, after ruling out other causes. Blood muscle enzymes (CK) are usually normal, which helps distinguish it from inflammatory muscle disease.
Can exercise help steroid myopathy?
Yes. Regular resistance and aerobic exercise help preserve and rebuild muscle during and after steroid treatment. A physical therapist can design a safe program, especially for people at risk of falls.
Should I stop my steroids if my muscles are weak?
No, not on your own. Stopping long-term steroids suddenly can be dangerous. Talk to your prescriber, who may reduce the dose gradually, switch to a different steroid or add steroid-sparing medicines.
Sources
This guide was written from current patient and clinical guidance, including:
- American College of Rheumatology: Glucocorticoid-induced osteoporosis and adverse effects guidance
- MedlinePlus: Prednisone drug information
- Muscular Dystrophy Association: Myopathies
- StatPearls (NCBI Bookshelf): Steroid-induced myopathy
- Endocrine Society: Treatment of Cushing's syndrome clinical practice guideline