All EMS presentations
HematologicClinical presentation

Sickle cell pain crisis

A streamlined, differential-led presentation for rapid clinical review.

Clinical snapshot

Twenty-second review

  • Sickle hemoglobin can polymerize during stress, causing vaso-occlusion, ischemic pain, hemolysis, and risks including acute chest syndrome, stroke, infection, and splenic complications.
  • Chest pain, hypoxia, fever, neurologic deficit, severe anemia signs, shock, pregnancy, or pain unlike the usual crisis is high risk.
  • Keep musculoskeletal injury or other abdominal or chest disease in the differential; overlapping or concurrent illness remains possible.
  • For sickle cell pain crisis, trends and combinations of findings are more informative than one isolated vital sign.
Differentials

Compare the clinical patterns

The repeated material is grouped inside each possibility. Open only the condition you need.

Serious3 conditions
Acute chest syndromeTime-sensitive high-risk possibility

HPI

Clarify usual crisis pattern; pain location and severity; chest pain, fever or dyspnea.

Signs & symptoms

Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.

Focused exam

Assess perfusion, bleeding sites, limb symmetry, skin changes, respiratory findings, and neurologic status; Trend pain, swelling, oxygenation, and circulation.

Brief pathophysiology

Acute chest syndrome may cause sickle cell pain crisis through a time-sensitive process capable of rapid physiological deterioration.

Vital-sign pattern

What the trend may show

Possible pattern

Hematologic differentials may affect oxygen delivery, thrombosis, bleeding, or infection risk. Rate, pressure, oxygenation, and temperature provide the most useful physiologic screen.

Heart rate (bpm)

May rise

Tachycardia may reflect anemia, pain, bleeding, fever, or hypoxia.

Blood pressure (mmHg)

May fall

Hypotension suggests significant bleeding, sepsis, or shock.

Oxygen saturation (SpO₂)

Interpret cautiously

SpO₂ measures saturation, not hemoglobin concentration or total oxygen content.

Temperature (°C)

Trend temperature

Fever raises concern for infection, especially with immune compromise.

Front-load in the triage report

  • Acute chest syndrome: Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.
  • Usual crisis pattern?
  • Pain location and severity?
StrokeTime-sensitive high-risk possibility

HPI

Clarify pain location and severity; chest pain, fever or dyspnea; hydration and triggers.

Signs & symptoms

Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.

Focused exam

Trend pain, swelling, oxygenation, and circulation; Assess pain pattern versus usual, lungs, oxygenation, temperature, hydration, neurologic status, infection, and prior acute chest syndrome.

Brief pathophysiology

Stroke may cause sickle cell pain crisis through a time-sensitive process capable of rapid physiological deterioration.

Vital-sign pattern

What the trend may show

Possible pattern

Stroke is a clinical diagnosis supported by time course and neurologic findings. Blood pressure and glucose affect eligibility and mimics; normal vitals do not exclude stroke.

Blood pressure (mmHg)

Often elevated

Hypertension is common in acute stroke; hypotension suggests another cause or poor perfusion.

Blood glucose (mmol/L)

Check every patient

Hypoglycemia can mimic focal deficit; hyperglycemia may accompany stress or diabetes.

Heart rate (bpm)

Assess rate / rhythm

An irregular rhythm may suggest atrial fibrillation but is not required.

Oxygen saturation (SpO₂)

Usually preserved

Hypoxemia requires correction and may indicate aspiration or another process.

Front-load in the triage report

  • Stroke: Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.
  • Pain location and severity?
  • Chest pain, fever or dyspnea?
SepsisTime-sensitive high-risk possibility

HPI

Clarify chest pain, fever or dyspnea; hydration and triggers; home analgesia and response.

Signs & symptoms

Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.

Focused exam

Trend pain, swelling, oxygenation, and circulation; Assess pain pattern versus usual, lungs, oxygenation, temperature, hydration, neurologic status, infection, and prior acute chest syndrome.

Brief pathophysiology

Sepsis may cause sickle cell pain crisis through a time-sensitive process capable of rapid physiological deterioration.

Vital-sign pattern

What the trend may show

Possible pattern

No single vital sign diagnoses sepsis. New tachypnea, abnormal temperature, tachycardia, or falling pressure—especially with altered mentation or poor perfusion—supports organ dysfunction and urgency.

Respiratory rate (breaths/min)

May rise early

Tachypnea is included in NEWS2 and can precede overt hypotension.

Temperature (°C)

High or low

Absence of fever does not exclude sepsis; hypothermia is concerning.

Heart rate (bpm)

Often rises

Tachycardia is common but may be blunted by age or medication.

Blood pressure (mmHg)

May fall

Relative hypotension and trend matter; profound hypotension can be late.

Front-load in the triage report

  • Sepsis: Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.
  • Chest pain, fever or dyspnea?
  • Hydration and triggers?
Common1 condition
Vaso-occlusive pain crisisCommon presentation pattern

HPI

Clarify usual crisis pattern; pain location and severity; chest pain, fever or dyspnea.

Signs & symptoms

Typical distributed pain without new organ findings may fit.

Focused exam

Assess perfusion, bleeding sites, limb symmetry, skin changes, respiratory findings, and neurologic status; Trend pain, swelling, oxygenation, and circulation.

Brief pathophysiology

Vaso-occlusive pain crisis may explain the presenting symptoms through a common clinical mechanism, while serial assessment checks for complications or an alternate cause.

Vital-sign pattern

What the trend may show

Possible pattern

Hematologic differentials may affect oxygen delivery, thrombosis, bleeding, or infection risk. Rate, pressure, oxygenation, and temperature provide the most useful physiologic screen.

Heart rate (bpm)

May rise

Tachycardia may reflect anemia, pain, bleeding, fever, or hypoxia.

Blood pressure (mmHg)

May fall

Hypotension suggests significant bleeding, sepsis, or shock.

Oxygen saturation (SpO₂)

Interpret cautiously

SpO₂ measures saturation, not hemoglobin concentration or total oxygen content.

Temperature (°C)

Trend temperature

Fever raises concern for infection, especially with immune compromise.

Front-load in the triage report

  • Typical distributed pain without new organ findings may fit.
  • Usual crisis pattern?
  • Pain location and severity?
Mimics3 conditions
Musculoskeletal injuryImportant alternative presentation

HPI

Clarify usual crisis pattern; pain location and severity; chest pain, fever or dyspnea.

Signs & symptoms

Not every pain episode is vaso-occlusion.

Focused exam

Assess perfusion, bleeding sites, limb symmetry, skin changes, respiratory findings, and neurologic status; Trend pain, swelling, oxygenation, and circulation.

Brief pathophysiology

Musculoskeletal injury can resemble sickle cell pain crisis through overlapping symptoms or referred physiology despite a different primary mechanism.

Vital-sign pattern

What the trend may show

Possible pattern

Isolated musculoskeletal injury often leaves central vital signs near baseline. Persistent abnormality should prompt reassessment for hemorrhage, thoracic injury, infection, or a medical cause.

Heart rate (bpm)

May rise with pain

Tachycardia can reflect pain or distress; trend after treatment.

Blood pressure (mmHg)

May rise with pain

Hypotension is not expected in an isolated minor injury.

Respiratory rate (breaths/min)

May rise with pain

Persistent tachypnea suggests more than a minor isolated injury.

Oxygen saturation (SpO₂)

Usually preserved

Desaturation suggests thoracic injury or concurrent disease.

Front-load in the triage report

  • Not every pain episode is vaso-occlusion.
  • Usual crisis pattern?
  • Pain location and severity?
Other abdominalImportant alternative presentation

HPI

Clarify pain location and severity; chest pain, fever or dyspnea; hydration and triggers.

Signs & symptoms

Not every pain episode is vaso-occlusion.

Focused exam

Trend pain, swelling, oxygenation, and circulation; Assess pain pattern versus usual, lungs, oxygenation, temperature, hydration, neurologic status, infection, and prior acute chest syndrome.

Brief pathophysiology

Other abdominal can resemble sickle cell pain crisis through overlapping symptoms or referred physiology despite a different primary mechanism.

Vital-sign pattern

What the trend may show

Possible pattern

Hematologic differentials may affect oxygen delivery, thrombosis, bleeding, or infection risk. Rate, pressure, oxygenation, and temperature provide the most useful physiologic screen.

Heart rate (bpm)

May rise

Tachycardia may reflect anemia, pain, bleeding, fever, or hypoxia.

Blood pressure (mmHg)

May fall

Hypotension suggests significant bleeding, sepsis, or shock.

Oxygen saturation (SpO₂)

Interpret cautiously

SpO₂ measures saturation, not hemoglobin concentration or total oxygen content.

Temperature (°C)

Trend temperature

Fever raises concern for infection, especially with immune compromise.

Front-load in the triage report

  • Not every pain episode is vaso-occlusion.
  • Pain location and severity?
  • Chest pain, fever or dyspnea?
Chest diseaseImportant alternative presentation

HPI

Clarify chest pain, fever or dyspnea; hydration and triggers; home analgesia and response.

Signs & symptoms

Not every pain episode is vaso-occlusion.

Focused exam

Trend pain, swelling, oxygenation, and circulation; Assess pain pattern versus usual, lungs, oxygenation, temperature, hydration, neurologic status, infection, and prior acute chest syndrome.

Brief pathophysiology

Chest disease can resemble sickle cell pain crisis through overlapping symptoms or referred physiology despite a different primary mechanism.

Vital-sign pattern

What the trend may show

Possible pattern

Hematologic differentials may affect oxygen delivery, thrombosis, bleeding, or infection risk. Rate, pressure, oxygenation, and temperature provide the most useful physiologic screen.

Heart rate (bpm)

May rise

Tachycardia may reflect anemia, pain, bleeding, fever, or hypoxia.

Blood pressure (mmHg)

May fall

Hypotension suggests significant bleeding, sepsis, or shock.

Oxygen saturation (SpO₂)

Interpret cautiously

SpO₂ measures saturation, not hemoglobin concentration or total oxygen content.

Temperature (°C)

Trend temperature

Fever raises concern for infection, especially with immune compromise.

Front-load in the triage report

  • Not every pain episode is vaso-occlusion.
  • Chest pain, fever or dyspnea?
  • Hydration and triggers?
Red flags

Findings that should escalate concern

  • Chest pain or hypoxemia
  • Fever
  • Neurologic deficit
  • Priapism
  • Chest pain, hypoxia, fever, neurologic deficit, severe anemia signs, shock, pregnancy, or pain unlike the usual crisis is high risk.
  • Acute chest syndrome, stroke, or sepsis: Respiratory symptoms, hypoxia, fever, focal deficit, or systemic compromise.
Related medications

Medication recognition

AmoxicillinCephalexinDoxycycline
Related EMS presentations

Continue the clinical pathway

CardiacChest pain / suspected ACSRespiratoryShortness of breath - undifferentiatedGeneral MedicalGeneral weakness / malaiseNeurologicStroke / TIAInfectiousFever / suspected infection / sepsis
References

Clinical and academic sources

Curated clinical guidance and peer-reviewed evidence supporting this presentation. Current BCEHS guidance, medical direction, and local policy remain authoritative for practice.

BCEHS Handbook — specific CPGs

  1. A02: Patient AssessmentBC Emergency Health Services Handbook

    Official BCEHS clinical practice guidance for patient assessment.

  2. E08: Pain ManagementBC Emergency Health Services Handbook

    Official BCEHS clinical practice guidance for pain management.

Supporting clinical and academic evidence

  1. CEDIS Presenting Complaint List updateCanadian Association of Emergency Physicians

    Presenting-complaint terminology and categorization context. It does not establish a prehospital “top 100” ranking.

  2. ASH Clinical Practice GuidelinesAmerican Society of Hematology

    Evidence-based guidance covering common hematologic emergencies, thrombosis, bleeding disorders, and sickle cell disease.

  3. Guidelines for emergencies and critical illness in patients with sickle cell diseaseAnnals of Intensive Care · 2025

    Vaso-occlusive pain, acute chest syndrome, infection, anemia, and emergency management priorities.