Osteoporosis and Bone Density: Screening, Prevention, and Treatment

Osteoporosis is often described as a disease of old age, which is only half right. The condition manifests in later life, but the trajectory is set decades earlier. Bone mass builds through childhood and adolescence, peaks somewhere in early adulthood, and declines gradually thereafter. How much you built, and how fast you lose it, together determine whether you reach a threshold where bones break under loads they should tolerate.

The frustrating feature of the condition is that it produces no symptoms at all until something breaks. There is no ache signalling that bone density is falling. The first indication for many people is a wrist fracture from a minor fall, a vertebral fracture causing sudden back pain, or a hip fracture with serious consequences for independence.

This guide covers how bone loss happens, who should be screened, what the tests mean, and what genuinely reduces fracture risk.

How Bone Loss Happens

Bone is not inert scaffolding. It is continually remodelled, with specialised cells breaking down old bone and others building new bone in its place. In a healthy young adult these processes are balanced.

With age, and particularly with certain hormonal changes, breakdown begins to outpace formation. Bone becomes less dense and its internal architecture deteriorates, with the fine internal struts thinning and losing connections. The result is bone that is both less mineralised and structurally weaker, which is why fracture risk rises more than density alone would suggest.

Osteopenia describes bone density below normal but not yet in the osteoporotic range. It is a risk state rather than a disease in itself, and it does not automatically require medication.

Osteoporosis describes density below a defined threshold, or the occurrence of a fragility fracture regardless of density.

Risk Factors

Not Modifiable

• Increasing age
• Female sex, with accelerated loss in the years following menopause as oestrogen declines
• Family history of osteoporosis or hip fracture
• Small body frame
• Previous fragility fracture, which is among the strongest single predictors

Modifiable or Manageable

• Physical inactivity. Bone responds to load; without it, density declines.
• Inadequate calcium and vitamin D. Both are needed for mineralisation, and deficiency is common. Our guide to vitamin D deficiency and testing covers that side.
• Low protein intake, which affects both bone matrix and the muscle that protects against falls.
• Smoking and excess alcohol, both independently associated with lower bone density and higher fracture risk.
• Very low body weight or significant undernutrition.
• Certain medications, notably long-term corticosteroids, some anticonvulsants, certain cancer treatments, and prolonged high-dose acid suppression in some analyses.
• Medical conditions including inflammatory arthritis, coeliac disease and other malabsorption, chronic kidney or liver disease, hyperthyroidism, hyperparathyroidism, and type 1 diabetes.

Thyroid status matters more than people realise, both from untreated overactivity and from over-replacement. Our guide to thyroid disorders covers why levels should not be pushed unnecessarily low.

Screening and Testing

DEXA Scan

Dual-energy x-ray absorptiometry is the standard test. It is quick, painless, and uses a very low radiation dose, far lower than a CT scan. It typically measures the hip and lumbar spine.

Results are reported as a T-score, comparing your density to that of a healthy young adult, and a Z-score, comparing you to others of your age and sex. Broadly, a T-score in the normal range indicates healthy density, a moderately reduced score indicates osteopenia, and a score below a defined threshold indicates osteoporosis. Your clinician interprets these alongside everything else rather than in isolation.

Fracture Risk Calculators

Density is only part of the picture. Tools such as FRAX combine age, sex, weight, height, previous fracture, family history, smoking, alcohol, steroid use, rheumatoid arthritis, and bone density to estimate the probability of fracture over the following decade. This is generally more useful for treatment decisions than density alone, because two people with identical scans can have very different risks.

Who Should Be Screened

Recommendations vary by country and continue to be revised, so confirm current guidance with your own doctor. Screening is generally considered for postmenopausal women above a certain age, for younger postmenopausal women and men with risk factors, for anyone who has sustained a fragility fracture, for people on long-term corticosteroids, and for those with conditions known to affect bone.

Men are substantially underscreened. Osteoporosis is less common in men but by no means rare, and outcomes after hip fracture are generally worse. Men with risk factors should not assume the condition does not apply to them.

Other Tests

Blood tests typically check calcium, vitamin D, kidney and liver function, thyroid function, and sometimes parathyroid hormone, to identify secondary causes of bone loss. Spine imaging may be used to detect vertebral fractures, many of which occur without the person realising.

Building and Protecting Bone Without Medication

Exercise That Actually Loads Bone

Bone adapts to mechanical stress, so the type of activity matters.

Weight-bearing impact activity such as walking, jogging, stair climbing, dancing, and racquet sports loads the skeleton directly. Swimming and cycling are excellent for cardiovascular health but do not load bone in the same way.

Resistance training is particularly valuable, since muscles pulling on bone stimulate remodelling, and stronger muscles reduce fall risk. Progressive loading matters more than any specific exercise. Our guides to choosing the right kind of exercise and home gym equipment worth buying cover practical implementation.

Balance and posture work such as tai chi reduces falls, which is where fractures actually come from.

An important caution: people with established osteoporosis, particularly with existing vertebral fractures, should avoid heavy forward bending and forceful twisting of the spine. Exercise programmes in this situation should be designed with a physiotherapist. Our overview of what physical therapy involves explains how that works.

Nutrition

Adequate calcium, vitamin D, and protein form the nutritional foundation. Requirements vary by age, sex, and circumstances, and both deficiency and excessive supplementation carry issues, so specific targets should come from your clinician rather than from a generic figure.

Dietary sources are generally preferred where possible: dairy products, fortified alternatives, tinned fish with bones, leafy greens, and legumes for calcium; oily fish and fortified foods for vitamin D, alongside sensible sun exposure. Protein spread across meals supports both bone matrix and muscle. Our guide to building balanced meals covers how to structure this.

Fall Prevention

This is frequently the most practical intervention and the most neglected. Most fractures result from falls, so reducing falls reduces fractures directly.

• Remove loose rugs, trailing cables, and clutter from walkways
• Improve lighting, particularly on stairs and on the route to the bathroom at night
• Install grab rails in bathrooms and handrails on both sides of stairs
• Wear supportive footwear indoors rather than loose slippers or socks
• Have vision checked regularly and keep prescriptions current
• Review medications that cause dizziness, drowsiness, or blood pressure drops
• Address hearing loss, which affects balance more than most people expect

Medication

Treatment is generally recommended for people with osteoporosis on scanning, those who have had a fragility fracture, and those whose calculated fracture risk exceeds a defined threshold. Osteopenia alone does not usually require medication unless calculated risk is high.

Available classes work either by slowing bone breakdown or by stimulating bone formation, and some are given as tablets, others as injections or infusions at intervals ranging from months to yearly. Each has specific considerations regarding kidney function, dental health, duration of use, and what happens when treatment stops.

Two practical points worth raising with your doctor. First, some medications require specific administration instructions, such as taking a tablet on an empty stomach with a full glass of water and remaining upright afterward; not following these reduces effectiveness and increases side effects. Second, a dental review before starting certain treatments is often recommended, and any planned dental surgery should be mentioned.

Discussing hormone-related options is relevant for some women around menopause; our guide to hormone replacement therapy, benefits and risks covers that decision, which involves considerations well beyond bone.

After a Fracture: The Care Gap

One of the most consistent findings in this field is that people who sustain a fragility fracture are frequently treated for the fracture and never assessed for osteoporosis. Yet a first fracture substantially increases the risk of a second, and that period is when intervention has the most value.

If you or a family member has broken a bone from a fall from standing height or less, ask explicitly whether bone density assessment is warranted. Many health systems now run fracture liaison services designed to close exactly this gap, but referral is not automatic everywhere.

Bone Health Across Life Stages

Because osteoporosis is a lifetime trajectory rather than a sudden event, what matters differs by age.

Childhood and adolescence. This is when the majority of adult bone mass is laid down, and peak bone mass is one of the strongest determinants of later fracture risk. Weight-bearing activity, adequate calcium and vitamin D, and sufficient overall nutrition during these years have effects that persist for decades. Prolonged low energy availability in young athletes, particularly where periods stop, damages bone accrual at exactly the wrong moment and warrants medical assessment.

Twenties and thirties. Peak bone mass is reached and then held. The goal is maintenance: staying active with loading exercise, not smoking, keeping alcohol moderate, and treating any condition or medication that affects bone.

Forties and the menopausal transition. Bone loss accelerates markedly in the years around and following menopause as oestrogen falls, and this is the period of most rapid decline in many women’s lives. It is a sensible point to review risk factors, discuss whether a baseline scan is warranted, and establish a resistance training habit if one does not exist. Our guide to the menopause transition covers the wider picture.

Sixties onward. Fracture prevention becomes the practical focus. Screening, fall prevention, adequate protein to preserve muscle, and treatment where risk is high all matter. Muscle loss and bone loss travel together, and maintaining strength protects against both the fall and the consequences of one.

At any age, after a fracture. A break from a minor fall is a signal regardless of age, and it should prompt assessment rather than being written off as bad luck.

Frequently Asked Questions

Does osteoporosis cause pain?

Not in itself. Pain arises from fractures. Vertebral fractures can cause sudden or chronic back pain, height loss, and a stooped posture, but bone loss without fracture is silent.

Can bone density be improved, or only maintained?

Modest improvement is possible with treatment and appropriate exercise, though the more important measure is fracture reduction rather than the number on a scan. Preventing further loss is itself a meaningful outcome.

Do men get osteoporosis?

Yes. It is less common than in women but far from rare, is underdiagnosed, and outcomes after hip fracture tend to be worse. Men with risk factors should be assessed rather than reassured by sex alone.

Are calcium supplements necessary?

Not for everyone. Dietary intake is generally preferred, and supplementation is used where intake is insufficient. Excessive supplementation has its own considerations, so discuss dosing with your doctor rather than self-prescribing.

How often should scans be repeated?

Intervals depend on your baseline result, risk factors, and whether you are on treatment. Repeating too frequently is unhelpful because change is slow. Your clinician will set an appropriate interval.

The Bottom Line

Osteoporosis is silent until it is not, and by then the first fracture has already happened. Because there are no symptoms to prompt action, screening and risk assessment do the work that symptoms usually do in other conditions.

If you have risk factors, ask about a DEXA scan and a fracture risk calculation rather than waiting. Load your skeleton with weight-bearing and resistance exercise, get enough protein, calcium, and vitamin D from food where possible, and take fall prevention seriously, because falls are what actually break bones. If you have already had a fragility fracture, treat that as a reason to be assessed for osteoporosis, not simply as an accident, because that assessment is the one most commonly missed and the one that matters most.