Emergency Medicine Book


Heat Related Illness

Aka: Heat Related Illness, Heat Illness, Heat Injury
  1. See Also
    1. Heat Edema
    2. Heat Cramps
    3. Heat Exhaustion
    4. Heat Stroke
    5. Temperature Regulation
    6. Heat Index
    7. Heat Illness Risk Factors
    8. Medications Predisposing to Heat Illness
    9. Heat Illness Prevention
  2. Physiology
    1. See Temperature Regulation
  3. Types: Heat Syndromes
    1. Heat Related Symptoms
      1. Heat Rash (Miliaria rubra, Sweat Rash, Prickly Heat)
        1. Papules, Pustules or vessicles in in occluded areas of excessive sweating (esp. children)
      2. Heat Edema
        1. Benign swelling of hands, feet, and ankles
        2. Associated with salt or water retention from heat
      3. Heat Syncope
        1. Dizziness or fainting after heat exposure
        2. Secondary to peripheral vasodilatation and venous pooling with secondary Postural Hypotension
        3. Seen in persons unaccustomed to extreme heat
        4. Move to cooler environment, and administer oral rehydration with salt containing solutions
        5. Consider Syncope differential diagnosis
      4. Heat Cramps
        1. Painful muscle contractions or cramps (esp. larger muscle groups)
    2. Exertional Heat Syndromes (spectrum of increasing severity)
      1. Heat Stress
        1. Core Temperature unchanged (<38 C or 100.4 F) and associated with decreased Exercise tolerance
      2. Heat Exhaustion
        1. Core Temperature rises above 38 C (100.4 F) associated with systemic symptoms
      3. Heat Stroke
        1. Core Temperature rises above 40 C (104 F) asssociated with Altered Level of Consciousness
  4. Risks
    1. See Heat Illness Risk Factors
    2. See Medications Predisposing to Heat Illness
  5. Management
    1. General Principles
      1. Rest
      2. Cooling
      3. Hydration
    2. Treat per degree of Heat Illness
      1. Heat Cramps
      2. Heat Exhaustion
      3. Heat Stroke
  6. Associated Conditions
    1. Rhabdomyolysis
  7. Prevention
    1. See Heat Illness Prevention
  8. References
    1. Czerkawski (1996) Your Patient Fitness 10(4): 13-20
    2. Sandor (1997) Physician SportsMed, 25(6):35-40
    3. Salinas and Ruttan (2017) Crit Dec Emerg Med 31(9): 3-10
    4. Barrow (1998) Am Fam Physician 58(3):749-56 [PubMed]
    5. Becker (2011) Am Fam Physician 83(11): 1325-30 [PubMed]
    6. Glazer (2005) Am Fam Physician 71(11):2133-42 [PubMed]
    7. Hett (1998) Postgrad Med 103(6):107-20 [PubMed]
    8. Howe (2007) Am J Sports Med 35(8): 1384-95 [PubMed]
    9. Wexler (2002) Am Fam Physician 65(11):2307-20 [PubMed]

Thermal injury (C0332685)

Definition (SCTSPA) Lesión traumática debida a calor intenso
Definition (SNOMEDCT_US) Injury due to increased heat
Definition (CSP) damage inflicted on any part of an organism as the direct or indirect result of exposure to a high temperature, with or without disruption of structural continuity.
Concepts Injury or Poisoning (T037)
SnomedCT 161006
English heat injury, thermal injuries, heat injuries, thermal injury, injuries heat, injuries thermal, Heat injury, Thermal injury (morphologic abnormality), Thermal injury, Heat injury, NOS, Thermal injury, NOS
Spanish injuria por calor, injuria térmica, lesión por calor, lesión traumática térmica (anomalía morfológica), lesión traumática térmica
Derived from the NIH UMLS (Unified Medical Language System)

Heat illness (C1456556)

Definition (MEDLINEPLUS)

Your body normally cools itself by sweating. During hot weather, especially with high humidity, sweating just isn't enough. Your body temperature can rise to dangerous levels and you can develop a heat illness. Most heat illnesses occur from staying out in the heat too long. Exercising too much for your age and physical condition are also factors. Older adults, young children and those who are sick or overweight are most at risk. Drinking fluids to prevent dehydration, replenishing salt and minerals, and limiting time in the heat can help.

Heat-related illnesses include

  • Heatstroke - a life-threatening illness in which body temperature may rise above 106![DEGREE SIGN]! F in minutes; symptoms include dry skin, rapid, strong pulse and dizziness
  • Heat exhaustion - an illness that can precede heatstroke; symptoms include heavy sweating, rapid breathing and a fast, weak pulse
  • Heat cramps - muscle pains or spasms that happen during heavy exercise
  • Heat rash - skin irritation from excessive sweating

Centers for Disease Control and Prevention

Concepts Injury or Poisoning (T037)
English Heat illness, Heat Illness
Spanish Enfermedad por calor
Dutch hitteaandoening
German Hitzekrankheit
Japanese ネッチュウショウ, 熱中症
Czech Tepelná nemoc
Portuguese Doença devido ao calor
Italian Malattia da calore
French Maladie due à la chaleur
Hungarian Hő betegség
Derived from the NIH UMLS (Unified Medical Language System)

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