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# Osteoporosis

os·te·o·po·ro·sis - OS-tee-oh-puh-ROH-sis

## Definition

Osteoporosis is a condition characterized by weakened bones that are more fragile and susceptible to fractures. The word literally means "porous bone" - under a microscope, healthy bone looks like a dense honeycomb, while osteoporotic bone [has](/glossary/hyaluronic-acid) much larger holes and spaces, making it less dense and less structurally sound.

Bone is living tissue that is constantly being broken down and rebuilt in a process called bone remodeling. In childhood and young adulthood, new bone is formed faster than old bone is removed, so bone mass increases. Peak bone mass is typically reached around age 30. After that point, bone remodeling continues but the balance gradually shifts - more bone is removed than replaced, leading to a gradual loss of bone density. In osteoporosis, this loss is accelerated, causing bones to become dangerously thin and fragile.

Osteoporosis is often called a "silent disease" because bone loss occurs without symptoms. Many people don't know they have osteoporosis until they experience a fracture from a minor fall, bump, or even a sneeze. The most common osteoporotic fractures occur in the hip, spine (vertebral compression fractures), and wrist. Hip fractures are particularly serious - approximately 20% of older adults who suffer a hip fracture die within one year.

## Also Known As

Brittle bone disease Bone loss Low bone density (when mild: osteopenia) 

## Key Facts

-   • An estimated 10 million Americans have osteoporosis and another 44 million have low bone density (osteopenia). 
-   • Women are four times more likely to develop osteoporosis than men, largely due to post-menopausal estrogen decline. 
-   • A DEXA scan (dual-energy X-ray absorptiometry) is the standard test for measuring bone density. 
-   • Weight-bearing exercise and resistance training are among the most effective strategies for building and maintaining bone density. 
-   • Calcium and vitamin D are essential for bone health - most adults need 1,000-1,200 mg of calcium and 600-800 IU of vitamin D daily. 
-   • Medications like bisphosphonates can slow bone loss and reduce fracture risk by 40-70%. 

## How It Relates To Your Health

If you're postmenopausal, over 50, have a family history of osteoporosis, or have risk factors like long-term corticosteroid use, low body weight, or smoking, bone density screening may be appropriate. Understanding your bone density status allows for early intervention that can prevent fractures.

Prevention starts decades before osteoporosis develops. Building strong bones in youth through calcium-rich nutrition, vitamin D, and weight-bearing exercise creates a larger bone "bank account" to draw from as age-related bone loss occurs. At any age, regular weight-bearing exercise (walking, dancing, stair climbing) and resistance training stimulate bone formation and slow bone loss.

## Related Terms

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## Related Conditions

[

### Osteoarthritis

Musculoskeletal 

Osteoarthritis is the most common form of arthritis, occurring when the protective cartilage that cushions the ends of bones gradually wears down over time. This causes pain, stiffness, and reduced mobility, most often in the knees, hips, hands, and spine.

Joint pain during or after movement Joint stiffness after rest Loss of flexibility 

Chronic Learn More 

](/conditions/osteoarthritis)

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## Sources

1.  [Osteoporosis](https://www.niams.nih.gov/health-topics/osteoporosis) - National Institute of Arthritis and Musculoskeletal and Skin Diseases (NIH)
2.  [Osteoporosis](https://www.mayoclinic.org/diseases-conditions/osteoporosis/symptoms-causes/syc-20351968) - Mayo Clinic
3.  [Bone Health and Osteoporosis](https://www.cdc.gov/bone-health/) - Centers for Disease Control and Prevention

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