Bone pain feels different from muscle or joint pain — it’s a deep, penetrating ache that doesn’t go away with rest and often worsens at night. The most common bone pain causes include fractures, osteoporosis, vitamin D deficiency, infections, and metastatic cancer. Less obvious causes like Paget’s disease, sickle cell crises, and medication side effects are frequently missed.
If you’re searching for why your bones hurt, you’re likely dealing with something that’s disrupting your daily life. The good news: most bone pain has an identifiable and treatable cause. The key is knowing which symptoms warrant an urgent workup versus which ones can wait for a routine appointment. Let’s break down the 12 most common causes, how they present, and what to do about each one.
How Bone Pain Differs From Joint and Muscle Pain
This distinction matters because it changes the entire diagnostic approach. Bone pain is typically constant, localized to a specific area, and described as “deep” or “boring.” It tends to worsen with weight-bearing or pressure on the affected bone.
Joint pain worsens with movement and improves with rest. Muscle pain is usually diffuse, associated with activity, and tender to direct palpation. If your pain feels like it’s coming from inside the bone itself — not the surface — that’s a red flag that deserves investigation.
12 Most Common Bone Pain Causes
| Cause | Typical Age Group | Pain Pattern | Key Diagnostic Test |
|---|---|---|---|
| Fracture / stress fracture | Any age | Sudden, localized, worse with activity | X-ray or MRI |
| Osteoporosis | 50+, postmenopausal women | Often silent until fracture occurs | DEXA scan (T-score ≤ −2.5) |
| Vitamin D deficiency | Any age | Diffuse, aching, bilateral | 25-OH vitamin D level (<20 ng/mL) |
| Metastatic bone disease | 40+ | Progressive, worse at night, unrelenting | Bone scan, PET-CT |
| Multiple myeloma | 65+ (median age at diagnosis) | Back/rib pain, pathologic fractures | SPEP, free light chains, bone survey |
| Osteomyelitis (bone infection) | Any age | Localized with fever, redness, swelling | MRI, blood cultures, ESR/CRP |
| Paget’s disease | 55+ | Deep ache in pelvis, skull, or long bones | Alkaline phosphatase, X-ray |
| Sickle cell disease (vaso-occlusive crisis) | Children and young adults | Severe episodic pain in extremities | Hemoglobin electrophoresis |
| Primary bone tumors (osteosarcoma, Ewing’s) | 10–25 | Progressive, localized, may have mass | MRI, biopsy |
| Hyperparathyroidism | 50+ | “Bones, stones, groans, moans” | Calcium, PTH levels |
| Leukemia | Children and older adults | Diffuse bone pain, fatigue, bruising | CBC with differential, bone marrow biopsy |
| Medication side effects (bisphosphonates, G-CSF) | Varies | Diffuse, onset within days of medication | Clinical correlation, drug history |
The Causes That Get Missed Most Often
Vitamin D Deficiency
This is probably the single most underdiagnosed cause of bone pain I see. Roughly 42% of U.S. adults have vitamin D levels below 20 ng/mL, and many of them have vague, diffuse bone aching they’ve attributed to “getting older.” A simple blood test costs under $50 and can identify a completely treatable problem.
Patients with levels below 10 ng/mL often develop osteomalacia — a softening of the bones that causes widespread pain, proximal muscle weakness, and a waddling gait. High-dose supplementation (50,000 IU weekly for 8–12 weeks) typically resolves symptoms within a few months.
Multiple Myeloma
Myeloma causes bone pain in roughly 70% of patients at diagnosis, most commonly in the spine and ribs. The pain is persistent, worsens with movement, and doesn’t respond to standard anti-inflammatories. Because the average patient is over 65, this pain is too often dismissed as “just arthritis.”
If you’re over 60 with new-onset back pain, unexplained anemia, elevated total protein, or kidney dysfunction — ask your doctor to check a serum protein electrophoresis (SPEP) and free light chains. These simple blood tests can catch myeloma months before it would otherwise be diagnosed.
Metastatic Cancer
Bone is the third most common site for cancer metastasis, after lung and liver. Breast, prostate, lung, kidney, and thyroid cancers are the top five primary tumors that spread to bone. The hallmark presentation: pain that is progressive, worse at night, and unresponsive to rest or over-the-counter painkillers.
How Bone Pain Gets Diagnosed
Your doctor will typically start with a thorough history and physical exam, then order tests based on the clinical picture. Here’s the general diagnostic pathway:
- First-line imaging: Plain X-rays — cheap, fast, and catch about 70% of structural problems. However, X-rays won’t show bone lesions until roughly 30–50% of bone density is lost.
- Advanced imaging: MRI for suspected infections, tumors, or stress fractures not visible on X-ray. CT for bony detail. PET-CT or bone scan for suspected metastatic disease.
- Blood work: CBC, comprehensive metabolic panel, calcium, phosphorus, alkaline phosphatase, vitamin D, PTH, ESR, and CRP cover most metabolic and inflammatory causes.
- Specialized labs: SPEP, free light chains, and urine protein electrophoresis if myeloma is suspected. PSA in men with new bone pain. Tumor markers when metastatic disease is a concern.
- Biopsy: Required when imaging suggests a primary bone tumor or when the diagnosis remains uncertain after non-invasive testing.
When to See a Doctor — Red Flags You Shouldn’t Ignore
Not all bone pain needs an emergency visit. A mild ache after a long hike is probably nothing. But certain patterns demand prompt evaluation:
- Night pain that wakes you up — classic for tumors and infections
- Pain that progressively worsens over weeks without any injury
- Bone pain with fever — suspect osteomyelitis until proven otherwise
- Unexplained weight loss alongside bone pain — cancer workup needed
- New bone pain in someone with a history of cancer — even years later, metastasis must be ruled out
- Pain with visible deformity or swelling — fracture, tumor, or Paget’s disease
- Diffuse bone pain with fatigue, bruising, or recurrent infections — think leukemia or myeloma
If any of these apply to you, don’t wait for your annual physical. Request an appointment within the week, and specifically ask your doctor whether imaging and blood work are warranted.
Frequently Asked Questions
Can anxiety or stress cause bone pain?
Stress itself doesn’t damage bone, but chronic stress elevates cortisol levels, which over time can reduce bone density and lower your pain threshold. What many people perceive as bone pain during stressful periods is usually musculoskeletal tension rather than true bone pathology. If the pain is persistent and localized, it’s worth getting checked regardless.
Why do my bones hurt more at night?
Nighttime bone pain has specific clinical significance. During the day, distractions and activity mask pain signals. At night, cortisol levels drop (cortisol has anti-inflammatory properties), and inflammatory mediators peak. More concerning: bone tumors — both primary and metastatic — classically cause pain that worsens at night. If this pattern persists for more than 2–3 weeks, see your doctor.
Can low iron cause bone pain?
Iron deficiency alone doesn’t directly cause bone pain. However, conditions that cause low iron — like myeloma, leukemia, or chronic inflammatory diseases — certainly do. If you have bone pain and unexplained anemia, that combination warrants a more thorough hematologic workup than treating the iron alone.
What vitamin deficiency causes bone pain?
Vitamin D deficiency is the most common nutritional cause of bone pain. Levels below 20 ng/mL are considered deficient, and levels below 10 ng/mL frequently cause symptomatic osteomalacia with diffuse bone tenderness. Vitamin C deficiency (scurvy) can also cause bone pain but is rare in developed countries. Calcium deficiency contributes indirectly by accelerating osteoporosis.
Should I worry about bone pain in my 20s or 30s?
Most bone pain in younger adults is from stress fractures (especially in runners and military recruits), vitamin D deficiency, or benign growths like osteoid osteomas. Serious causes like primary bone tumors (osteosarcoma, Ewing sarcoma) peak in the teens and early 20s. If your bone pain is localized, progressive, and not explained by an obvious injury, an X-ray is a reasonable first step — don’t let anyone dismiss it because of your age.
