What Causes Early Onset Osteoporosis?

Osteoporosis—characterized by weakened bones and increased fracture risk—is often thought of as a condition affecting older adults. However, early onset osteoporosis (EOO) refers to bone loss that occurs before age 50. Understanding what causes early onset osteoporosis can help you spot warning signs, address underlying issues, and work with your healthcare team to protect your bone health.

How Bone Health Works

Your bones are living tissue, constantly being broken down and rebuilt in a process called remodeling. In youth and early adulthood, bone formation outpaces breakdown, leading to peak bone mass by around age 30. After that, breakdown gradually exceeds formation. When bone loss accelerates or peak bone mass is too low, osteoporosis can develop.

Key Factors Behind Early Onset Osteoporosis

Multiple factors—genetic, medical, lifestyle and environmental—can disrupt the balance of bone remodeling and lead to osteoporosis at a younger age. Below are the most common contributors.

1. Genetic and Developmental Factors

• Family History
  A close relative with osteoporosis or fractures suggests you may inherit lower peak bone mass or other risk traits.
• Genetic Disorders
  Conditions like osteogenesis imperfecta (“brittle bone disease”), Ehlers–Danlos syndrome, and certain metabolic bone diseases directly weaken bone structure.
• Low Peak Bone Mass
  Inadequate nutrition, chronic illness or hormonal imbalances during childhood and adolescence can prevent you from building strong bones.

2. Hormonal and Endocrine Disorders

• Hypogonadism
  Low estrogen in women (from early menopause, amenorrhea or excessive exercise) and low testosterone in men both impair bone formation.
• Hyperthyroidism
  Excess thyroid hormone speeds up bone turnover, causing net bone loss.
• Cushing’s Syndrome
  High cortisol levels—whether from an adrenal gland disorder or long-term steroids—interfere with bone-building cells.
• Diabetes
  Both type 1 and type 2 diabetes can negatively affect bone quality and increase fracture risk.

3. Chronic Diseases and Autoimmune Conditions

• Inflammatory Bowel Disease (IBD)
  Crohn’s disease and ulcerative colitis can impair nutrient absorption (especially calcium and vitamin D) and often require steroids that weaken bone.
• Rheumatoid Arthritis and Lupus
  Inflammation and corticosteroid treatment contribute to bone loss.
• Celiac Disease
  Undiagnosed or untreated celiac disease damages the small intestine, reducing calcium uptake.
• Chronic Kidney or Liver Disease
  Impaired organ function disrupts vitamin D activation and calcium/phosphate balance.

4. Medications

Long-term or high-dose use of certain drugs can accelerate bone loss:

• Glucocorticoids (e.g., prednisone)
• Aromatase inhibitors and certain cancer treatments
• Some anticonvulsants (e.g., phenytoin, phenobarbital)
• Heparin and other anticoagulants
• Proton-pump inhibitors (with prolonged use)

5. Lifestyle and Nutritional Factors

• Low Body Weight
  A body mass index (BMI) below 19 is linked to lower bone density.
• Poor Nutrition
  Diets lacking in calcium, vitamin D, protein or other bone-supporting nutrients limit bone formation.
• Sedentary Lifestyle
  Weight-bearing and muscle-strengthening exercises stimulate bone growth. Lack of activity leads to bone thinning.
• Excessive Alcohol and Smoking
  Both interfere with bone remodeling and calcium absorption.
• Eating Disorders
  Anorexia nervosa and bulimia cause severe nutritional deficiencies and hormonal changes that damage bone.

6. Other Contributing Factors

• Immobilization or Paralysis
  Lack of mechanical stress on bones (e.g., after spinal cord injury) accelerates bone loss.
• Reproductive Factors
  Pregnancies close together, prolonged breastfeeding without appropriate nutrition supplementation.
• Rare Conditions
  Hematologic diseases (like multiple myeloma), mastocytosis and certain metabolic disorders.

Signs and Symptoms

Early onset osteoporosis often has no symptoms until a fracture occurs. Keep an eye out for:

• Fractures from minor falls or bumps
• Gradual loss of height or a stooped posture
• Back pain caused by vertebral fractures

If you notice any of these, consider a free, online symptom check, using the doctor approved Ubie Symptom Checker to help guide your next steps.

Diagnosing Early Onset Osteoporosis

A healthcare provider will typically recommend:

• Bone Mineral Density (BMD) Test (DEXA scan)
• Blood tests to evaluate calcium, vitamin D, thyroid and hormone levels
• Screening for celiac disease, kidney/liver function, inflammatory markers
• Review of medications and lifestyle factors

Prevention and Management Strategies

Addressing risk factors early can protect your bones and reduce future fractures.

Lifestyle and Nutrition

• Engage in weight-bearing exercises (walking, jogging, strength training) at least 3–4 times per week.
• Aim for a balanced diet rich in:
  • Calcium (dairy, leafy greens, fortified foods)
  • Vitamin D (sunlight exposure, fatty fish, fortified dairy or supplements)
  • Protein (lean meats, legumes, nuts)
• Limit alcohol to moderate levels and quit smoking.

Medical Treatments

• Calcium and Vitamin D Supplements
• Bisphosphonates or other bone-building medications (e.g., denosumab, selective estrogen receptor modulators, teriparatide)
• Hormone replacement therapy when indicated
• Regular monitoring of BMD and lab values

Address Underlying Conditions

• Optimize treatment for thyroid disorders, diabetes, autoimmune diseases and gastrointestinal malabsorption.
• Work with specialists (endocrinologists, rheumatologists, gastroenterologists) as needed.

When to Seek Professional Help

If you have risk factors for early onset osteoporosis or experience unexplained fractures, back pain or height loss, it’s important to talk with your healthcare provider. Early diagnosis and intervention can preserve your bone health and quality of life.

Always consult a doctor about any symptoms or conditions that might be life-threatening or serious. Your healthcare provider can develop a personalized plan to address what causes early onset osteoporosis in your case and guide you toward the best preventive and treatment strategies.