Multiple Myeloma Symptomatology
Multiple myeloma in patients aged 60s–70s typically presents with bone pain (particularly back pain), fatigue, and anemia, with the classic CRAB features (hypercalcemia, renal insufficiency, anemia, and bone lesions) present in approximately 74% of symptomatic cases at diagnosis. 1
Age and Demographics
The median age at diagnosis ranges from 63 to 70 years, making this age group the most commonly affected population 2, 1, 3. Males are affected approximately twice as frequently as females 4, 5.
Primary Clinical Manifestations
CRAB Criteria (Present in ~74% of symptomatic cases)
The hallmark features are captured by the CRAB acronym 1, 6:
- C - Calcium elevation: Serum calcium >11.5 mg/dl (or >11.0 mg/dl in some criteria), occurring in approximately 14-19% of patients 1, 4
- R - Renal insufficiency: Serum creatinine >1.73 μmol/l (or >2 mg/dl) or creatinine clearance <40 ml/min, present in approximately 28% of patients 1, 4
- A - Anemia: Normochromic, normocytic anemia with hemoglobin ≥2 g/dl below normal or <10 g/dl, occurring in approximately 94% of patients at presentation 1, 4
- B - Bone lesions: Lytic lesions, severe osteopenia, or pathological fractures, present in approximately 75% of patients 1, 4
Most Common Presenting Symptoms
Bone-related symptoms dominate the clinical picture 4, 7, 5:
- Bone pain: 56.8-80.3% of patients, with back pain/vertebral fractures being most common (47%) 4, 7, 5
- Chest/shoulder pain (including rib pain and fractures): 20% 7
- Fatigue/tiredness: 59.2-81.9% of patients 4, 5
- Weight loss: 20.1% 8
Skeletal Involvement Pattern
When lytic lesions are present 4:
- Vertebrae: 74.5% of cases with bone involvement
- Ribs: 35.2%
- Skull: 27.5%
- Long bones (femur, humerus): 5.9%
Non-CRAB Manifestations (Present in ~20% of symptomatic cases)
Important to recognize that approximately 20% of patients present with non-CRAB features 9, including:
- Neuropathy (spinal cord compression, nerve root compression, peripheral neuropathy)
- Recurrent bacterial infections 10
- Hyperviscosity syndrome
- Extramedullary involvement
- Hemorrhage/coagulopathy
- Systemic symptoms (fever, weight loss)
Laboratory Findings at Presentation
Hematologic Parameters
- Mean hemoglobin: 8.9-9.4 g/dl, with severe anemia (<8.5 g/dl) in 40.9% 4, 5
- Thrombocytopenia: 26.6% 8
- Elevated ESR: Mean 89.5 mm/1st hour, present in 92.7% 4
Biochemical Parameters
- Elevated serum creatinine (≥2.0 mg/dl): 34.2% 4
- Hypoalbuminemia (<3.5 g/dl): 75.7% 8
- Elevated β2-microglobulin (>5.5 mg/dl): 57.8% 4
- Elevated LDH: 36% when documented 4
Monoclonal Protein Patterns
- IgG type: 72.7-73% 4, 8
- IgA type: 18.2-27.2% 4, 8
- Light chain only: 22.5% 8
- Non-secretory: 4.1% 8
- Bence Jones proteinuria: 46.7% 4
Critical Clinical Caveats
In elderly patients (60s-70s), many laboratory abnormalities can mimic myeloma but are due to unrelated conditions 10:
- Mild renal impairment may be from diabetes or hypertension, not myeloma
- Anemia could be from iron/B12/folate deficiency, chronic disease, or myelodysplastic syndrome
- Diffuse osteoporosis with long-standing progressive compression fractures suggests benign disease; sudden onset indicates active myeloma
- Stable hypercalcemia with absent lytic lesions suggests hyperparathyroidism—check PTH levels
Disease Stage at Presentation
Most patients present with advanced disease 4, 8:
Diagnostic Timeline
The median time from symptom onset to diagnosis is 4 months (range 2-10 months) 7. Factors associated with delayed diagnosis beyond 12 weeks include:
- Seeing allied healthcare professionals (physiotherapists, chiropractors) first
- Presenting with infection symptoms
- Chest or shoulder pain as primary complaint
Conversely, older age is associated with faster diagnosis (within 12 weeks) 7.
Initial Misdiagnoses
52% of patients receive other diagnoses before myeloma is confirmed 7, most commonly:
- Musculoskeletal disorders (47.8%): osteoporosis, costochondritis, muscle strains
- These misdiagnoses contribute to diagnostic delays