What is Osteoporosis?
Osteoporosis is a condition in which bone loses density and structural quality, making fractures far more likely — particularly of the hip, spine, and wrist. It is diagnosed by a DXA bone density scan showing a T-score of -2.5 or lower, or by a fragility fracture. It causes no symptoms until a bone breaks, which is why screening matters.
Key takeaways
- Osteoporosis is silent until a fracture occurs; there is no pain from low bone density itself.
- A DXA T-score of -2.5 or below defines osteoporosis; -1.0 to -2.5 is called osteopenia or low bone mass.
- Screening is recommended for women 65 and older, and earlier for those with risk factors.
- A fragility fracture after age 50 — a break from a fall from standing height — establishes the diagnosis regardless of T-score.
- Weight-bearing and resistance exercise, adequate calcium and vitamin D, and fall prevention are all part of care.
Overview
Bone is living tissue that is constantly broken down and rebuilt. Through childhood and early adulthood building outpaces breakdown, peak bone mass is reached in the late twenties, and afterward the balance slowly tips the other way. Osteoporosis is what happens when that loss goes far enough that the internal scaffolding of bone becomes thin and porous. The bone looks normal from the outside, causes no symptoms, and gives no warning — until a fall that would once have caused a bruise causes a fracture instead.
The consequences are substantial. Hip fractures in older adults carry high rates of loss of independence and increased mortality in the year that follows, and spinal compression fractures cause height loss, curvature, and chronic pain. The encouraging part is that osteoporosis is both detectable before a fracture and treatable, with medications that reduce fracture risk meaningfully. Yet treatment rates after a first fragility fracture remain low, which is one of the clearest gaps in preventive care.
What Osteoporosis is
Bone density is measured by dual-energy X-ray absorptiometry, or DXA, usually at the hip and lumbar spine. The result is reported as a T-score comparing your density with that of a healthy young adult. A T-score of -1.0 or above is normal, between -1.0 and -2.5 is low bone mass (osteopenia), and -2.5 or lower is osteoporosis. Z-scores, which compare against people of the same age and sex, are used in younger adults and children.
Density is not the whole story. Bone quality — the architecture of the internal trabecular network and the rate of turnover — also determines strength, which is why fracture risk calculators combine density with clinical factors such as age, previous fracture, steroid use, and smoking rather than relying on the T-score alone.
Common symptoms
Osteoporosis is asymptomatic until a fracture occurs; the symptoms listed here are those of fractures and advanced bone loss.
- No symptoms — low bone density itself causes no pain
- A fracture from a minor fall or low-impact event, especially of the wrist, hip, or spine
- Sudden severe back pain — may indicate a spinal compression fracture
- Loss of height over time, often more than 1.5 inches (about 4 cm)
- A stooped posture or increased curvature of the upper spine
- Chronic back ache from accumulated vertebral changes
Less common symptoms
- Reduced lung capacity or early fullness after eating, from spinal deformity compressing the chest and abdomen
- Tooth loss or a receding jaw line linked to bone loss
- Fractures in unusual sites such as the ribs from coughing
Risk factors
- Older age — bone loss accelerates in both sexes with advancing age
- Postmenopausal status — estrogen loss causes rapid bone loss in the first years after menopause
- Previous fragility fracture after age 50 — the strongest single predictor of the next one
- Long-term oral corticosteroid use — a major and often overlooked cause of secondary osteoporosis
- Low body weight and a small frame — less bone mass to lose in the first place
- Smoking and heavy alcohol use — both directly impair bone formation
- Family history of hip fracture, particularly in a parent
- Low calcium and vitamin D intake, and eating disorders or malabsorption conditions such as celiac disease
- Medical conditions including rheumatoid arthritis, overactive thyroid or parathyroid, chronic kidney disease, and hypogonadism
Causes
Osteoporosis arises when bone resorption by osteoclasts outpaces formation by osteoblasts. In women, the sharp fall in estrogen at menopause removes a brake on resorption, producing several years of accelerated loss. In both sexes, age reduces osteoblast activity, calcium absorption falls, vitamin D status often declines, and reduced physical loading removes the mechanical signal that maintains bone.
Secondary osteoporosis has an identifiable driver and is worth actively looking for. Long-term corticosteroids are the most common; others include overactive thyroid or parathyroid glands, celiac disease and other malabsorption, chronic kidney or liver disease, low sex hormone levels, some anticonvulsants, aromatase inhibitors, and androgen deprivation therapy.
How it is diagnosed
Diagnosis rests on bone density measurement, fracture history, and a search for treatable secondary causes.
| Test or assessment | What it looks at |
|---|---|
| DXA bone density scan | Measures density at the hip and lumbar spine and reports a T-score. A T-score of -2.5 or lower at either site meets the diagnostic threshold. |
| FRAX or similar fracture risk tool | Combines age, sex, weight, fracture history, steroid use, smoking, and other factors — with or without bone density — to estimate 10-year fracture probability. |
| Vertebral fracture assessment or spine imaging | Detects silent spinal compression fractures, which change the diagnosis and treatment threshold even when the T-score is not in the osteoporosis range. |
| Blood and urine testing for secondary causes | Calcium, phosphate, vitamin D, kidney and liver function, thyroid and parathyroid hormone, and celiac screening where indicated. |
| Height measurement | Serial standing height is a simple, useful marker; loss of more than 1.5 inches (about 4 cm) prompts spinal imaging. |
Treatment overview
Treatment combines nutrition, exercise, fall prevention, and — for those at meaningful fracture risk — medication. The categories below describe what is used; selection, sequencing, and dosing are set by a clinician.
Calcium and vitamin D adequacy
Enough calcium, preferably from food, and sufficient vitamin D underpin every other treatment. Supplements are used to fill gaps rather than as therapy in themselves.
Weight-bearing and resistance exercise
Loading the skeleton through walking, stair climbing, and progressive resistance training helps maintain density and, importantly, improves strength and balance.
Fall prevention
Balance training, home hazard removal, vision correction, and reviewing medicines that cause dizziness. Most fractures require both weak bone and a fall.
Bisphosphonates
The most widely used medication class, slowing bone breakdown and reducing spine and hip fracture risk. Available orally or by infusion.
Other antiresorptive therapy
Denosumab, a twice-yearly injection, is an alternative; it requires careful planning because stopping it without follow-on therapy causes rapid bone loss.
Anabolic (bone-building) therapy
Teriparatide, abaloparatide, and romosozumab actively build bone and are used for severe osteoporosis or after fracture on other treatment, followed by an antiresorptive agent.
Hormonal options
Menopausal hormone therapy and selective estrogen receptor modulators are considered in specific situations, weighing individual risks and benefits.
Lifestyle considerations
- Do weight-bearing activity most days — walking, stair climbing, dancing, or jogging if your bones and joints allow.
- Add progressive resistance training two or three times a week; muscle pull is a direct stimulus to bone.
- Include balance work such as tai chi or single-leg stance practice to reduce falls.
- Get calcium from food first: dairy, fortified plant milks, canned fish with bones, tofu set with calcium, and leafy greens.
- Check vitamin D status if you have limited sun exposure, darker skin, or malabsorption.
- Stop smoking and keep alcohol modest — both directly impair bone formation.
- Make the home safer: remove loose rugs, improve lighting, add grab rails, and wear supportive shoes indoors.
- Review medicines that cause drowsiness or low blood pressure with your clinician, since they raise fall risk.
Prevention
- Build peak bone mass in childhood and early adulthood through activity, adequate calcium, and vitamin D.
- Stay physically active throughout life, with an emphasis on loading and balance as you age.
- Avoid smoking and limit alcohol.
- Maintain a healthy body weight; being underweight is a significant risk factor.
- Get screened: DXA is generally recommended for women 65 and older, and earlier for postmenopausal women with risk factors.
- After any fracture from a fall from standing height at age 50 or older, ask specifically about bone assessment.
- Discuss bone protection when starting long-term corticosteroids or certain cancer therapies.
Warning signs and when to get help
Signs that need emergency care
If you believe you are experiencing a medical emergency, call emergency services immediately (911 in the United States).
- Sudden severe back pain after a minor movement, especially with leg weakness, numbness, or loss of bladder or bowel control — seek emergency care
- Inability to bear weight or an obviously deformed limb after a fall — possible hip or long bone fracture
- Severe pain after a fall in anyone taking long-term steroids or with known osteoporosis
Signs that warrant a prompt appointment
These are not emergencies, but they are worth a call to your clinician rather than a wait-and-see.
- Any fracture from a fall from standing height or less
- Height loss of more than 1.5 inches (about 4 cm), or new stooped posture
- New or worsening back pain without an obvious cause
- Repeated falls or new unsteadiness
- Jaw pain, non-healing dental extraction sites, or new thigh pain while on bone medication
Questions to ask a healthcare professional
Take these to your next appointment — or build an agenda with the Appointment Prep tool.
- What is my T-score, and what is my estimated 10-year fracture risk?
- Do I need treatment now, or is monitoring appropriate?
- Have secondary causes of bone loss been checked?
- How much calcium and vitamin D should I be getting, and from where?
- What type of exercise is safe and useful for my bones?
- How long would I stay on this medication, and is a drug holiday relevant?
- What dental work should I complete before starting treatment?
- Can I be referred for a falls assessment or balance program?
Frequently asked questions
What does a T-score of -2.5 mean?
It means bone density is 2.5 standard deviations below the average for a healthy young adult, which is the threshold used to diagnose osteoporosis. A score between -1.0 and -2.5 is called low bone mass or osteopenia, and above -1.0 is considered normal.
Do calcium supplements prevent fractures?
Calcium and vitamin D support bone health and are important alongside treatment, but on their own supplements have shown only modest fracture reduction in trials, mainly in people who were deficient. Food sources are generally preferred, and very high supplemental doses are not advised.
Is osteoporosis only a women's condition?
No. Roughly one in five men over 50 will have an osteoporosis-related fracture, and men have higher mortality after hip fracture. Osteoporosis in men is substantially underdiagnosed and undertreated.
What exercise is best for bone density?
Weight-bearing impact activity such as brisk walking, stair climbing, or jogging combined with progressive resistance training gives the strongest stimulus. Balance work matters just as much, because preventing the fall prevents the fracture.
Should I worry about jaw problems from bone medication?
Osteonecrosis of the jaw is a rare complication, much more common at cancer-treatment doses than at osteoporosis doses. Completing invasive dental work before starting and maintaining good oral hygiene reduce risk further. Discuss any planned extractions with both your dentist and prescriber.
Sources
- NIAMS — Osteoporosis — NIH overview of bone biology, testing, and treatment
- Bone Health & Osteoporosis Foundation — Patient guidance on nutrition, exercise, and medication
- USPSTF — Osteoporosis to Prevent Fractures: Screening — Screening recommendation for women 65 and older
- MedlinePlus — Osteoporosis — Consumer summary and related tests
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