How steroid medications weaken bones through a "triple hit" mechanism, why treatment thresholds are lower, and how to protect yourself.
If you take steroid medications (glucocorticoids) for conditions such as rheumatoid arthritis, asthma, or inflammatory bowel disease, you should know that steroids are one of the most common causes of secondary osteoporosis.
If it is caught early, steroid-induced bone loss can be prevented and treated effectively. This article explains how steroids affect your bones, when prevention should begin, and what you can do to protect yourself.
Steroids affect bone in three main ways. Together they make bone loss faster and more dangerous than age-related osteoporosis alone.
Steroids directly inhibit osteoblasts (the cells that build new bone). So your body's ability to repair and rebuild bone drops from the first day of steroid use.
Steroids promote the activity of osteoclasts (the cells that break down bone), so bone is removed faster. At the same time, less bone is rebuilt, and the balance tips the wrong way.
Steroids decrease calcium absorption from the intestine and increase calcium loss through the kidneys. This leaves the body short of calcium over time, which weakens bones further.
The combination of reduced bone building, increased bone breakdown, and calcium depletion makes steroid-induced osteoporosis progress especially fast.
Steroid-induced bone loss is front-loaded: it is fastest in the first few months:
| Time period | Approximate bone density loss |
|---|---|
| First 3–6 months | 6–12% loss (rapid phase) |
| After first year | 2–3% per year (ongoing) |
For comparison, postmenopausal bone loss is typically 1–3% per year. Steroid-induced bone loss can be 3–5 times faster, especially at the start.
Because bone loss is so rapid in the first months, fractures can occur within the first year of steroid use, before a bone density test would normally be scheduled. This is why guidelines recommend starting prevention early.
For standard osteoporosis, treatment is usually started when the T-score reaches −2.5. For steroid-induced osteoporosis, the threshold is lower. The Japanese guideline (2014 revision) applies to anyone taking, or planning to take, oral steroids for 3 months or more. Add up the points below; a total of 3 or more means treatment is recommended.
| Factor | Points |
|---|---|
| Previous low-trauma fracture | 7 |
| Age | 50–64: 2 / 65 or older: 4 |
| Steroid dose (prednisolone equivalent, per day) | 5 to under 7.5 mg: 1 / 7.5 mg or more: 4 |
| Bone density (% of young adult mean) | 70 to under 80%: 2 / under 70%: 4 |
Anyone aged 65 or older already scores 4 from age alone, so treatment is recommended even with normal bone density.
Do not wait until your bone density reaches −2.5. Steroids increase fracture risk before bone density drops that far, because they damage bone quality as well as bone quantity.
Steroid-induced osteoporosis is treatable. There are several effective treatment options, and the right one depends on factors such as how low your bone density is, whether you have already had a fracture, and the dose of steroids you take.
Because steroids damage bone in particular ways, the best treatment can differ from person to person, and from someone with ordinary age-related osteoporosis. Your doctor can assess your situation and recommend the approach that suits you. If you've been on steroids for several months or more, ask about protecting your bones now.
Regardless of which treatment is chosen, calcium and vitamin D supplementation is considered standard alongside steroid-induced osteoporosis treatment:
Many patients on long-term steroids see several specialists, such as a rheumatologist for arthritis, a pulmonologist for asthma, or a gastroenterologist for IBD. The question is whose job it is to manage bone health.
Don't assume someone else is managing your bones. Ask directly.
Work with your doctor to:
Even while on steroids, weight-bearing exercise helps maintain bone:
Inhaled steroids for asthma and topical steroids for skin conditions have minimal effect on bone density at normal doses. This article primarily applies to oral or injected glucocorticoids.
Guidelines generally identify ≥5 mg of a standard oral steroid per day (or equivalent) for ≥3 months as the threshold for concern. However, even lower doses over longer periods may affect bone. If you are on any oral steroid for more than a few weeks, it is worth asking your doctor.
Repeated short courses can accumulate and affect bone over time. If you find yourself needing steroid bursts several times a year, discuss cumulative bone risk with your doctor.
Standard-dose inhaled corticosteroids have minimal effect on bone density. High-dose inhaled steroids over many years may have a small effect. Rinse your mouth after use (this is for oral health, not bone health).
Ask your doctor for a bone density test (DEXA scan) at your next appointment. Mention how long you have been on steroids and at what dose. It is never too late to start protection. Even if bone loss has already occurred, treatment can reduce fracture risk.
This article provides general medical information and is not intended as a substitute for professional medical advice. If you are taking steroids and have concerns about your bone health, please consult your doctor.
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Medical Supervision
Hiroyuki Katoh（Orthopedic Surgeon, board-certified by the Japanese Orthopaedic Association）
Last updated:August 4, 2026