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Last reviewed: 12 Aug 2025
Last updated: 09 Sep 2025

Summary

Definition

History and exam

Key diagnostic factors

  • severe diffuse or localized pain in an extremity
  • fever
  • localized swelling or erythema
  • hypotension
  • diffuse, scarlatina-like erythematous rash

Other diagnostic factors

  • acute mental status changes
  • influenza-like symptoms
  • muscular tenderness and weakness
  • gastrointestinal symptoms
  • features of myocarditis
  • endophthalmitis
  • hypothermia

Risk factors

  • diabetes mellitus
  • alcohol-use disorder
  • minor trauma and injuries with bruising, hematoma formation, or muscle strain
  • surgical procedures (e.g., vaginal delivery, breast reconstruction, cesarean section, hysterectomy, liposuction, bunionectomy)
  • prolonged use (>6 hours) of single tampon
  • use of highly absorbent tampons
  • nonsteroidal anti-inflammatory drug (NSAID) use
  • use of contraceptive sponges, diaphragms, and IUDs
  • untreated strep throat

Diagnostic tests

1st tests to order

  • microscopy and culture (blood, wound, fluid, tissue)
  • CBC
  • coagulation profile
  • serum BUN and creatinine
  • urinalysis
  • LFTs
  • creatine kinase (CK)
  • serum calcium
  • serum sodium
  • serum phosphorus
  • serum albumin
  • serum lactic acid

Tests to consider

  • Staphylococcus aureus antibody testing
  • chest x-ray

Treatment algorithm

Contributors

Authors

​Attending Physician

Associate Professor of Emergency Medicine

Department of Emergency Medicine

Brooke Army Medical Center

Fort Sam Houston

TX

Disclosures

BJL declares that he has no competing interests.

Dr Brit J. Long would like to gratefully acknowledge Dr Marie R. Baldisseri and Dr Walid Khayr, previous contributors to this topic.

Disclosures

MRB and WK declare they have no competing interests.

Peer reviewers

Associate Professor

Department of Critical Care Medicine and Department of General Surgery

Geisinger Medical Center

Danville

PA

Disclosures

MJR declares that she has no competing interests.

Head

Critical Care Division

The Methodist Hospital

Houston

TX

Disclosures

JZ declares that she has no competing interests.

Professor in Medicine at University of Versailles SQY

Director of the General ICU at Raymond Poincaré Hospital (AP-HP)

Director of the Center for Clinical Research and Technology Innovation (INSERM)

Garches

France

Disclosures

DA is an author of a number of references cited in this topic.

BMJ Best Practice topics are updated on a rolling basis in line with developments in evidence and guidance. The peer reviewers listed here have reviewed the content at least once during the history of the topic.

Disclosures

Peer reviewer affiliations and disclosures pertain to the time of the review.

References

Our in-house evidence and editorial teams collaborate with international expert contributors and peer reviewers to ensure that we provide access to the most clinically relevant information possible.

Key articles

Centers for Disease Control and Prevention. Streptococcal toxic shock syndrome (STSS): 2010 case definition. 2010 [internet publication].Full text

Evans L, Rhodes A, Alhazzani W, et al. Surviving sepsis campaign: international guidelines for management of sepsis and septic shock 2021. Crit Care Med. 2021 Nov 1;49(11):e1063-143.Full text  Abstract

Stevens DL, Bisno AL, Chambers HF, et al. Practice guidelines for the diagnosis and management of skin and soft tissue infections: 2014 update by the Infectious Diseases Society of America. Clin Infect Dis. 2014;59:e10-e52.Full text  Abstract

Sartelli M, Guirao X, Hardcastle TC, et al. 2018 WSES/SIS-E consensus conference: recommendations for the management of skin and soft-tissue infections. World J Emerg Surg. 2018;13:58.Full text  Abstract

Reference articles

A full list of sources referenced in this topic is available here.

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