Skip to main content

Saturn Medic

Clinical Subject Page

Thyroid Storm

Thyroid Storm is a life-threatening extreme manifestation of thyrotoxicosis caused by severe excess thyroid hormone activity, resulting in multisystem decompensation involving the cardiovascular, neurological, and gastrointestinal systems

Also called

Thyrotoxic Crisis

ICD-10

E05.01

Specialty

Endocrine

Onset

Acute

Reviewed

August 2026

On This Page

Overview

–Thyroid Storm is a rare but potentially fatal complication of uncontrolled hyperthyroidism


-It is characterized by an acute exaggeration of thyroid hormone effects causing high fever, severe tachycardia, altered mental status, and organ dysfunction

-The most common underlying cause is untreated or poorly controlled Graves Disease.

Etiology & Risk Factors

-Etiology:

Thyroid Storm occurs when a patient with hyperthyroidism develops sudden worsening of thyroid
hormone effects due to increased physiological stress.


-Common underlying causes:
• Graves Disease
• Toxic multinodular goiter
• Toxic adenoma

 

-Risk Factors

• Untreated or poorly controlled hyperthyroidism
• Graves Disease
• Sudden withdrawal of antithyroid medications
• Infection (common trigger)
• Surgery
• Trauma
• Myocardial infarction

Pathophysiology

-Underlying hyperthyroidism
→ Triggering event (infection, surgery, trauma, medication withdrawal)
→ Sudden increase in thyroid hormone effects
→ ↑ Metabolic activity + ↑ Adrenergic sensitivity
→ ↑ Heat production + ↑ Oxygen consumption→ Cardiovascular stress → Tachycardia + arrhythmias + heart failure
→ CNS stimulation → Agitation + delirium + altered consciousness
→ Gastrointestinal dysfunction → Vomiting + diarrhea + dehydration
→ Multisystem failure → Thyroid Storm

Clinical Presentation

-Symptoms:

• High fever
• Severe sweating
• Palpitations
• Shortness of breath
• Anxiety
• Agitation
• Confusion
• Weakness
• Nausea and vomiting

-Signs:

• High temperature
• Marked tachycardia
• Hypertension initially, followed by hypotension in severe cases
• Atrial fibrillation
• Tremor
• Agitation or delirium
• Dehydration

History Taking

-Ask about:

• Previous diagnosis of hyperthyroidism
• Graves Disease history
• Recent medication changes
• Stopping antithyroid medications
• Symptoms of hyperthyroidism:
• Weight loss
• Heat intolerance
• Tremor
• Palpitations
• Fever symptoms
• Recent infection
• Recent surgery or trauma

Physical Examination

-General Examination

• Assess airway, breathing, and circulation
• Measure temperature
• Measure heart rate
• Measure blood pressure
• Assess hydration status
• Assess mental status
• Look for agitation or confusion

 

-System-Specific Examination:

-Cardiovascular
• Severe tachycardia
• Irregular rhythm due to atrial fibrillation
• Signs of heart failure:
• Peripheral edema
• Raised jugular venous pressure
• Lung congestion


-Neurological
• Anxiety
• Agitation
• Delirium
• Reduced consciousness
• Coma in severe cases

Investigations

-Biochemistry / Specific Tests

-Thyroid Function Tests
Typical findings:
• ↓ TSH
• ↑ Free T4
• ↑ Free T3
However, hormone levels may overlap with uncomplicated hyperthyroidism.


-Electrolytes
May show:
• Dehydration-related abnormalities
• Hyponatremia in severe cases


-Liver Function Tests
May show abnormalities due to:
• Thyroid hormone effects
• Drug-related toxicity
• Multiorgan dysfunction


-Glucose
May show:
• Hyperglycemia due to stress response


-Inflammatory Markers
May help identify triggering infection:
• C-reactive protein (CRP)
• Other infection markers when indicated

Diagnosis

-Thyroid Storm is diagnosed clinically based on:


• History of hyperthyroidism or thyrotoxicosis
• Acute deterioration
• Severe systemic manifestations

Home / Home / Clinical Cases / Endocrine System Clinical Cases / Thyroid Storm
Related Topics

Management

1. First-Line / Emergency Management

Thyroid Storm

  • Admit to intensive care.

  • Stabilize airway, breathing, and circulation.

  • Give oxygen and IV fluids as needed.

  • Control fever.

  • Identify and treat the precipitating cause.

 

2. Definitive Treatment

Rapidly reduce thyroid hormone effects by:

  • Blocking hormone synthesis.

  • Blocking hormone release.

  • Reducing peripheral conversion and effects of thyroid hormones.

 

3. Medical Treatment

  • Propranolol / Esmolol: control tachycardia and adrenergic symptoms.

  • Propylthiouracil (PTU) / Methimazole: block thyroid hormone synthesis.

  • Iodine: given after antithyroid medication to reduce hormone release.

  • Hydrocortisone: reduces peripheral conversion of thyroxine (T4) to triiodothyronine (T3) and supports possible adrenal insufficiency.

  • Supportive treatment: cooling, IV fluids, electrolyte correction, and treatment of the trigger.

 

4. Surgical / Procedural Treatment

Emergency thyroidectomy may be considered when:

  • Medical treatment fails.

  • Antithyroid drugs are contraindicated.

  • Severe disease persists despite treatment.

 

5. Supportive Management

  • Continuous cardiac monitoring

  • Frequent vital-sign assessment

  • Treat heart failure if present

Complications

• Heart failure
• Arrhythmias (especially atrial fibrillation)
• Shock
• Respiratory failure
• Multiorgan dysfunction
• Coma
• Death

Prognosis

-Thyroid Storm has significant mortality risk if untreated, but outcomes improve greatly with rapid
recognition and aggressive management.


-Prognosis depends on:
• Speed of diagnosis and treatment
• Patient age
• Presence of heart failure or organ dysfunction
• Underlying cause
• Response to therapy

Key Points / Clinical Pearls

• Thyroid Storm is a life-threatening complication of severe thyrotoxicosis.
• It is most commonly caused by uncontrolled Graves Disease.
• Common triggers include infection, surgery, trauma, and stopping antithyroid medication.
• Diagnosis is mainly clinical.
• Classic features include fever, tachycardia, CNS changes, and gastrointestinal symptoms.
• Thyroid hormone levels may not distinguish thyroid storm from uncomplicated hyperthyroidism.
• Treatment requires rapid control of thyroid hormone effects.
• Beta-blockers control sympathetic symptoms.
• Antithyroid drugs block new hormone synthesis.

  • Ross DS, Burch HB, Cooper DS, et al. 2016 American Thyroid Association Guidelines for Diagnosis and Management of Hyperthyroidism and Other Causes of Thyrotoxicosis. Thyroid. 2016;26(10):1343-1421. Thyroid .
  • Satoh T, Isozaki O, Suzuki A, et al. 2016 Guidelines for the Management of Thyroid Storm From the Japan Thyroid Association and Japan Endocrine Society. Endocr J. 2016;63(12):1025-1064. Endocrine Journal .
  • Akamizu T. Thyroid Storm: A Japanese Perspective. Thyroid. 2018;28(1):32-40. Thyroid .
  • Idrose AM. Acute and Emergency Care for Thyrotoxicosis and Thyroid Storm. Acute Med Surg. 2015;2(3):147-157. Acute Medicine & Surgery .
  • Chiha M, Samarasinghe S, Kabaker AS. Thyroid Storm: An Updated Review. J Intensive Care Med. 2015;30(3):131-140.
  • National Library of Medicine (NIH). Thyroid Storm . StatPearls.