Osteoporosis: Symptoms, Causes, Diagnosis, Treatment & Prevention Guide

Osteoporosis is often called a "silent disease" for a simple, frightening reason: it usually causes no pain, no visible symptoms, and no warning at all — until the day a minor stumble or an ordinary sneeze results in a broken bone. In Bangladesh, where sunlight is abundant but vitamin D deficiency remains widespread due to indoor lifestyles and covering clothing, and where bone density (DEXA) scanning is still limited outside major cities, osteoporosis is a genuinely under-diagnosed condition — especially among postmenopausal women and the elderly. This guide explains, in detail, what osteoporosis actually is, how doctors diagnose it using specific numerical thresholds, what modern treatment involves, and how it can be prevented.

What Is Osteoporosis?

Osteoporosis is a progressive skeletal disease in which bone mineral density and bone mass decrease, and the internal microarchitecture of bone weakens, making bones fragile and much more likely to fracture. Bone is living tissue that is constantly being broken down and rebuilt. Up to roughly the mid-30s, bone-building outpaces bone breakdown; after that, the balance gradually reverses. When this loss accelerates — commonly after menopause, or with age, certain diseases, or certain medications — bone strength falls faster than the body can rebuild it, and osteoporosis develops.

Causes and Risk Factors

Osteoporosis risk comes from a mix of factors you cannot change and factors you can influence.

Non-modifiable risk factors

• Age over 65 years
• Being female — women lose bone density faster than men, especially in the years following menopause, due to falling estrogen levels
• A family history of fracture, particularly a parent's hip fracture
• Small body frame
• Early menopause or surgical removal of the ovaries
• Low testosterone in men

Modifiable risk factors

• Inadequate calcium and vitamin D intake over the long term
• Physical inactivity, especially lack of weight-bearing exercise
• Smoking
• Excess alcohol consumption
• Long-term use of glucocorticoid (steroid) medications
• Untreated hyperthyroidism or excess thyroid hormone medication

Certain medical conditions and long-term medications — including some cancer treatments, chronic kidney or liver disease, rheumatoid arthritis, and malabsorption disorders — can also accelerate bone loss, which is why doctors often look for an underlying secondary cause, particularly in men and younger patients.

Symptoms: Why It's Called a Silent Disease

In its early and middle stages, osteoporosis typically produces no pain or noticeable symptom at all — bone density can fall for years without a person feeling anything different. Because of this, many people first discover they have osteoporosis only after a fracture occurs from a fall that would not normally break a healthy bone (known as a "fragility fracture"), most commonly in the:

• Hip
• Vertebrae of the spine
• Wrist

As the disease progresses, some people do notice indirect signs: gradual loss of height over the years, a stooped or hunched posture (caused by silent compression fractures in the spinal vertebrae), and persistent back pain that develops without an obvious injury. Any of these should prompt a medical evaluation rather than being dismissed as normal aging.

Diagnosis: T-Scores, DEXA Scans, and the FRAX Tool

The gold-standard test for osteoporosis is Dual-Energy X-ray Absorptiometry (DEXA or DXA), a low-radiation scan — usually of the hip and spine — that measures bone mineral density and produces a result called a T-score. According to the World Health Organization's diagnostic reference standard, T-scores are classified as follows:

• Normal: T-score of 0 to −1.0
• Osteopenia (low bone mass, a precursor stage): T-score between −1.0 and −2.5
• Osteoporosis: T-score of −2.5 or lower at the femoral neck (hip)

Importantly, if someone already has a fragility fracture of the hip or spine — even if their T-score only falls in the osteopenia range — doctors classify this as severe or "established" osteoporosis, because a fracture has already proven the bone is not strong enough.

Alongside the T-score, many doctors also calculate a FRAX score (Fracture Risk Assessment Tool, developed by the University of Sheffield), which estimates a person's 10-year probability of a major fracture using factors such as age, sex, BMI, prior fragility fracture, parental hip fracture history, smoking, steroid use, alcohol intake, and rheumatoid arthritis. Generally, treatment is recommended when the 10-year hip-fracture risk is 3% or higher, or the risk of any major osteoporotic fracture is 20% or higher — even if the T-score alone would not clearly indicate osteoporosis.

In Bangladesh, DEXA/BMD testing is available mainly in larger cities and specialised diagnostic centres. Costs vary widely: around 500–1,500 taka at government hospitals and medical college hospitals, versus roughly 1,500–3,500 taka at private diagnostic centres. Because access is limited outside major urban areas, many cases go undiagnosed until a fracture occurs — which is exactly why postmenopausal women and people over 65 should proactively ask their doctor about screening rather than waiting for symptoms.

Osteoporosis vs. Osteoarthritis: Not the Same Disease

These two are frequently confused because both are common in older adults, but they are fundamentally different diseases. Osteoporosis is a loss of bone density and strength — it is typically painless until a fracture happens, and it is diagnosed with a DEXA scan. Osteoarthritis, on the other hand, is wear-and-tear damage to the cartilage that cushions joints, causing pain, stiffness, and swelling directly in the affected joint (commonly the knee, hip, or hand), and is diagnosed mainly through clinical examination and X-rays of the joint itself. It is possible — and common in elderly patients — to have both conditions at the same time.

Treatment

Osteoporosis treatment combines lifestyle measures, calcium and vitamin D correction, and — where the fracture risk is significant — bone-strengthening medication.

Calcium and vitamin D

Adequate calcium and vitamin D intake is the foundation of treatment. Dietary calcium of around 1,000–1,200 mg per day, combined with vitamin D of around 800 IU per day, has been shown to meaningfully reduce hip fracture risk in postmenopausal women. In clinical studies, a vitamin D dose of roughly 700–800 IU/day reduced relative hip fracture risk by about 26% and any non-vertebral fracture risk by about 23% — but notably, vitamin D appears to reduce fracture risk mainly when calcium is also adequate, not on its own. Your doctor or pharmacist can advise the right combination and dose for your individual situation; do not self-prescribe high-dose supplements without guidance, since excess calcium can carry its own risks (such as kidney stones).

Bisphosphonates (first-line medication)

For people with confirmed osteoporosis or high fracture risk, bisphosphonates (such as alendronate, risedronate, ibandronate, or intravenous zoledronic acid) are the standard first-line medication, typically prescribed for up to about 5 years orally or up to about 3 years intravenously, with periodic reassessment. Oral bisphosphonates must be taken correctly to work safely and be properly absorbed: on a completely empty stomach, at least 30 minutes before any food, drink, or other medication, followed by remaining upright (sitting or standing, not lying down) for at least 30 minutes, to avoid irritation of the esophagus. Never adjust the dose or stop this medication without your doctor's guidance.

Other options

Denosumab, given as an injection every six months, can increase bone density faster than bisphosphonates in some patients. However, its bone-protective effect fades within months of stopping the injections, so once started, it generally needs to be continued or followed by another bone-protecting medication under a doctor's supervision — it should never simply be discontinued without a follow-up plan.

Special Considerations

• Postmenopausal women face the sharpest rise in osteoporosis risk due to falling estrogen, making regular screening after menopause particularly important.
• Elderly patients of both sexes carry the added danger of falls — combining osteoporosis with fall-prevention measures at home (removing loose rugs, improving lighting, installing bathroom grab bars) is essential, since a fall is often the direct trigger for a fracture.
• Men can and do develop osteoporosis, often linked to low testosterone or an underlying secondary cause, and it is frequently under-recognised because it is popularly seen as a "women's disease."
• People on long-term steroid medication (for asthma, rheumatoid arthritis, or other chronic conditions) should discuss bone density monitoring with their doctor, since steroids are a well-known accelerant of bone loss.

When to See a Doctor

Consult a doctor promptly if you experience: a fracture from a minor fall or bump that would not normally injure a healthy person; noticeable loss of height over time; new or worsening stooped posture; unexplained persistent back pain; or if you are a postmenopausal woman, over 65, or have a family history of hip fracture and have never been screened. Early diagnosis, while bones are only mildly weakened, gives treatment the best chance of preventing a first fracture altogether.

Prevention

• Get regular weight-bearing and muscle-strengthening exercise — walking, climbing stairs, and resistance exercise all help maintain bone density
• Ensure adequate dietary calcium (dairy, small fish eaten with bones, dark leafy greens) and vitamin D (sensible sun exposure, fortified foods, or supplements if a doctor recommends them)
• Avoid smoking entirely
• Keep alcohol intake moderate
• Review any long-term steroid or other bone-affecting medication with your doctor periodically
• For elderly family members, fall-proof the home and correct vision problems that increase fall risk

Sources: Guidelines and data from the National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIAMS/NIH), the World Health Organization (WHO) bone density reference standard, the International Osteoporosis Foundation, and published research on osteoporosis prevalence and bone mineral density testing in Bangladesh.