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Bone Loss: Causes, Symptoms & Treatment

Bone loss refers to the reduction in bone mass and density, making bones fragile and prone to fractures. Learn about causes, symptoms, diagnosis, and treatment options.

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Things worth knowing about "Bone loss"

Bone loss refers to the reduction in bone mass and density, making bones fragile and prone to fractures. Learn about causes, symptoms, diagnosis, and treatment options.

What Is Bone Loss?

Bone loss describes the progressive reduction of bone mass and bone density. The most common medical condition associated with bone loss is osteoporosis, in which bones become porous, weak, and susceptible to fractures. Bone is living tissue that constantly renews itself through a balance of bone formation and bone resorption. When resorption exceeds formation over time, bone loss occurs. Older adults, especially postmenopausal women, are most frequently affected.

Causes

Bone loss can result from a variety of factors, including:

Hormonal changes: The decline of estrogen after menopause in women and testosterone in older men accelerates bone resorption.
Calcium and Vitamin D deficiency: Both nutrients are essential for maintaining bone strength. Inadequate intake increases the risk of bone loss.
Physical inactivity: A lack of weight-bearing exercise weakens bones over time.
Genetic predisposition: A family history of osteoporosis significantly raises the risk.
Medications: Long-term use of corticosteroids is a well-known contributing factor to bone loss.
Chronic diseases: Conditions such as celiac disease, rheumatoid arthritis, and kidney disease can impair bone health.
Lifestyle factors: Smoking, excessive alcohol consumption, and low body weight are additional risk factors.

Symptoms

Bone loss is often called a silent disease because it progresses without obvious symptoms until a fracture occurs. Common signs of advanced bone loss include:

Fractures from minor trauma (e.g., a low-impact fall), particularly at the spine, wrist, or hip
Back pain caused by vertebral compression fractures
Loss of height and a progressively stooped posture (sometimes called a dowager hump)
Reduced mobility and impaired balance

Diagnosis

The primary diagnostic tool for bone loss is the bone density scan (DXA scan), which uses low-dose X-rays to measure bone mineral density. Blood tests may also be performed to assess calcium, vitamin D, and hormone levels. Results are evaluated using the T-score, which compares an individual bone density to that of a healthy young adult. Additional imaging and risk assessment tools such as the FRAX calculator can help estimate fracture risk.

Treatment

General Measures

Managing bone loss typically involves a combination of lifestyle changes and medical therapy:

Calcium-rich diet: Dairy products, leafy green vegetables, and nuts are excellent sources of dietary calcium.
Vitamin D supplementation: Adequate sun exposure and vitamin D supplements help maintain healthy bone metabolism.
Regular exercise: Weight-bearing and resistance training strengthen bones and muscles while reducing the risk of falls.
Avoiding risk factors: Quitting smoking, limiting alcohol intake, and maintaining a healthy body weight are important preventive measures.

Medical Treatment

When bone loss is confirmed or fracture risk is elevated, several medications are available:

Bisphosphonates (e.g., alendronate): Inhibit bone resorption and are the most commonly prescribed treatment for osteoporosis.
Denosumab: A monoclonal antibody that slows bone breakdown.
Hormone replacement therapy (HRT): May be used in postmenopausal women to stabilize estrogen levels and protect bone density.
Teriparatide: A parathyroid hormone analogue that actively stimulates new bone formation, used in severe cases of osteoporosis.

Prevention

Bone loss can often be delayed or reduced through early preventive action. A balanced diet rich in calcium and vitamin D, regular physical activity, and a healthy lifestyle are the most effective strategies. Routine medical check-ups, particularly for individuals with known risk factors, allow for early detection and timely intervention.

References

World Health Organization (WHO): Assessment of fracture risk and its application to screening for postmenopausal osteoporosis. WHO Technical Report Series, No. 843, Geneva, 1994.
National Osteoporosis Foundation: Clinician's Guide to Prevention and Treatment of Osteoporosis. Washington DC, 2022. Available at: https://www.bonehealthandosteoporosis.org
Kanis, J.A. et al.: European guidance for the diagnosis and management of osteoporosis in postmenopausal women. Osteoporosis International, 30(1), 2019, pp. 3-44.

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