Carolinas HealthCare System

Health Information - Disease

Search Health Information   

Thyroid storm


Thyroid storm is a life-threatening condition that develops in cases of untreated thyrotoxicosis (hyperthyroidism, or overactive thyroid).

Alternative Names

Thyrotoxic storm; Hyperthyroid storm; Accelerated hyperthyroidism

Causes, incidence, and risk factors

Thyroid storm results from untreated hyperthyroidism. It is usually brought on by a stress such as trauma or infection.


Symptoms are severe and may include:

Signs and tests

  • The top number in a blood pressure reading may be high
  • Heart rate is increased

Blood tests are done to evaluate thyroid function.

  • TSH is usually too low to detect.
  • Thyroid hormone levels such as free T4 and total T3 are high.


Congestive heart failure and pulmonary edema can develop rapidly and lead to death.

Calling your health care provider

This is an emergency condition. Call 911 or another emergency number if you have hyperthyroidism and experience symptoms of thyroid storm.


AACE Thyroid Task Force. American Association of Clinical Endocrinologists medical guidelines for clinical practice for the evaluation and treatment of hyperthyroidism and hypothyroidism. Endocr Pract. 2002;8(6):457-469.

Ladenson P, Kim M. Thyroid. In: Goldman L and Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders; 2007:chap 244.

Davies TF, Larsen PR. Thyrotoxicosis. In: Kronenberg HM, Melmed S, Polonsky KS, Larsen PR, eds. Williams Textbook of Endocrinology. 11th ed. Philadelphia, Pa: Saunders Elsevier;2008:chap 11.

Review Date: 6/4/2012
Reviewed By: Shehzad Topiwala, MD, Chief Consultant Endocrinologist, Premier Medical Associates, The Villages, FL. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M. Health Solutions, Ebix, Inc.
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
About Carolinas HealthCare System
Who We Are
Community Benefit
Corporate Financial Information
Diversity & Inclusion
Annual Report
Patient Links
Pay Your Bill
Hospital Pre-Registration
Patient Rights
Financial Assistance
Quality & Value Reports
Join Carolinas HealthCare System
Physician Careers

For Employees
Carolinas Connect
Connect with Us
Watch Carolinas HealthCare on YoutubeFollow Carolinas HealthCare on TwitterLike Carolinas HealthCare on FacebookContact Carolinas HealthCareJoin Carolinas HealthCare on LinkedInGo to our mobile website.