What Is Secondary Osteoporosis and What Causes It?

Osteoporosis is a condition where bones become weak and more likely to break. While most people think of osteoporosis as something that happens with age—often called primary osteoporosis—about 20% of cases arise from another underlying issue. This is known as secondary osteoporosis.

Secondary osteoporosis occurs when a distinct medical condition or medication speeds up bone loss or prevents normal bone formation. Understanding the causes can help you and your healthcare provider take timely steps to protect your bone health.

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How Secondary Osteoporosis Differs from Primary Osteoporosis

Primary osteoporosis is largely due to aging and hormonal changes, especially after menopause in women. In contrast, secondary osteoporosis:

• Has an identifiable trigger beyond normal aging.
• Can affect younger people, even children or young adults.
• May improve or stabilize if the underlying cause is treated.

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Common Secondary Osteoporosis Causes

Below are some of the most frequent culprits behind secondary osteoporosis. Knowing these can guide you in discussions with your doctor and in lifestyle adjustments.

1. Medications

Certain drugs can interfere with bone metabolism and promote bone loss:

• Glucocorticoids (steroids): Used in asthma, arthritis, autoimmune diseases. Even short-term high-dose use can decrease bone formation.
• Proton pump inhibitors (PPIs): Long-term use for acid reflux can reduce calcium absorption.
• Selective serotonin reuptake inhibitors (SSRIs): Common antidepressants linked to reduced bone density.
• Anticonvulsants: Some epilepsy medications alter vitamin D metabolism.
• Heparin: Long-term therapy may impair bone formation.
• Chemotherapy and certain cancer treatments: Can disrupt hormone levels and bone remodeling.

2. Endocrine and Hormonal Disorders

Hormones regulate the balance between bone building and breakdown. When they’re out of whack, bone can suffer:

• Hyperthyroidism: Excess thyroid hormone speeds up bone turnover.
• Hyperparathyroidism: Too much parathyroid hormone causes calcium to leach from bones.
• Cushing’s syndrome: High cortisol levels (from tumors or medications) weaken bone.
• Hypogonadism: Low estrogen in women or low testosterone in men reduces bone density.

3. Gastrointestinal and Nutritional Issues

Malabsorption and poor nutrient intake can deprive bones of what they need to stay strong:

• Celiac disease: Gluten-induced damage to the small intestine hinders calcium and vitamin D absorption.
• Inflammatory bowel disease (Crohn’s, ulcerative colitis): Chronic inflammation and certain medications affect bone health.
• Bariatric surgery: Weight-loss operations can limit absorption of calcium and vitamin D.
• Eating disorders: Severe restriction of calories and nutrients starves bones of essential building blocks.

4. Chronic Inflammatory and Autoimmune Diseases

Ongoing inflammation can tip the balance toward bone breakdown:

• Rheumatoid arthritis and lupus: Both the disease process and the steroid treatments raise the risk.
• Chronic obstructive pulmonary disease (COPD): Inflammation, reduced physical activity, and steroid use all play a role.

5. Hematologic and Other Systemic Diseases

Some blood and organ disorders directly affect bone cells:

• Multiple myeloma: Cancer of plasma cells triggers bone destruction.
• Leukemia and lymphoma: Treatments and the disease itself can reduce bone mass.
• Chronic kidney disease: Impaired activation of vitamin D and disturbances in calcium/phosphate levels.

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Who Is at Risk?

While anyone with these conditions or taking certain medications can develop secondary osteoporosis, some factors increase vulnerability:

• Early menopause (before age 45)
• Long-term steroid use (more than 3 months)
• Chronic diseases lasting years
• Family history of osteoporosis
• Lifestyle factors such as smoking, excessive alcohol, and very low body weight

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Symptoms and Signs

Osteoporosis often progresses silently until a fracture occurs. Watch for:

• Fractures from minor falls or injuries
• Gradual loss of height
• Curvature of the spine (kyphosis)
• Back pain from vertebral fractures

If you notice any of these signs, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to help clarify what might be happening and what steps to take next.

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Diagnosis

1. Bone Mineral Density (BMD) Test
   A DXA scan measures bone density at key sites (spine, hip, wrist).

2. Laboratory Tests
   Blood and urine tests check for:

   • Calcium, vitamin D, and phosphate levels
   • Thyroid, parathyroid, adrenal, and sex hormone function
   • Markers of bone turnover

3. Medical History and Exam
   Your doctor will review medications, lifestyle, family history, and any conditions known to cause bone loss.

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Treatment and Management

Addressing secondary osteoporosis involves a two-pronged approach: treating the underlying cause and strengthening bone.

A. Treat the Underlying Cause

• Adjust or switch medications when possible.
• Manage hormonal imbalances (e.g., treat hyperthyroidism).
• Control chronic diseases with the goal of reducing inflammation.

B. Support Bone Health

• Calcium and Vitamin D: Aim for 1,000–1,200 mg of calcium and 600–800 IU of vitamin D daily, through diet and supplements as needed.
• Weight-bearing Exercise: Walking, jogging, dancing, and resistance training help stimulate bone formation.
• Lifestyle Changes:
  • Quit smoking
  • Limit alcohol to no more than one drink per day for women, two for men
  • Maintain a healthy weight
• Medications for Osteoporosis:
  • Bisphosphonates (e.g., alendronate)
  • Denosumab
  • SERMs (selective estrogen receptor modulators)
  • Parathyroid hormone analogs (for severe cases)

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Prevention Tips

Even if you have a condition that can cause secondary osteoporosis, you can still take steps to protect your bones:

• Eat a balanced diet rich in calcium (dairy, leafy greens) and vitamin D (sunlight, fortified foods, oily fish).
• Stay as active as your health allows, focusing on strength and balance to prevent falls.
• Discuss bone-friendly medication alternatives with your doctor if you’re on long-term steroids or other high-risk drugs.
• Get regular bone density screenings if you have risk factors.

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When to Seek Medical Advice

Bone loss can be silent until it leads to fracture. See your doctor if you have:

• A recent low-impact fracture
• Sudden height loss or posture change
• Chronic conditions or medications known to affect bone health
• Persistent bone or back pain

Always speak to a doctor about anything that could be life threatening or serious. Early detection and management of secondary osteoporosis can stop further bone loss and reduce fracture risk.

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Secondary osteoporosis is manageable when you understand its causes and act early. By working with your healthcare team, adjusting treatments, and adopting bone-friendly habits, you can protect your bones and maintain a strong, active life.