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Update: Heat Illness, Active Component, U.S. Armed Forces, 2020

Image of MSMR article 2. Fort Jackson, SC. A trainee with 2nd Battalion, 60th Infantry Regiment puts his arms in an arm immersion cooling tank during training. The tanks allow Soldiers to rapidly cool by putting their forearms into a tank of ice water. (Photo by Saskia Gabriel)

What Are the New Findings?

During 2016–2020, annual rates of both heat stroke and heat exhaustion among active component service members peaked in 2018 but were the lowest in 2020. The annual numbers of heat illnesses diagnosed in Iraq and Afghanistan have trended downward since 2016.

What Is the Impact on Readiness and Force Health Protection?

This analysis demonstrates again the magnitude of risks of heat illnesses among active component service members and the enhanced risks associated with sex age, location of assignment, and occupational categories. Recognition of these risk factors should inform the preventive measures that military leaders, trainers, and service members routinely employ.


In 2020, there were 475 incident cases of heat stroke and 1,667 incident cases of heat exhaustion among active component service members. The overall crude incidence rates of heat stroke and heat exhaustion were 0.36 cases and 1.26 cases per 1,000 person-years; both were the lowest annual rates in the 2016-2020 surveillance period. In 2020, subgroup-specific rates of both incident heat stroke and heat exhaustion were highest among males, those less than 20 years old, Asian/Pacific Islanders, Marine Corps and Army members, recruit trainees, and those in combat-specific occupations. During 2016–2020, a total of 341 heat illnesses were documented among service members in Iraq and Afghanistan; 7.0% (n=24) were diagnosed as heat stroke. Commanders, small unit leaders, training cadre, and supporting medical personnel must ensure that the military members whom they supervise and support are informed about the risks, preventive countermeasures, early signs and symptoms, and first-responder actions related to heat illnesses.


Heat illness refers to a group of disorders that occur when the elevation of core body temperature surpasses the compensatory limits of thermoregulation.1 Heat illness is the result of environmental heat stress and/or exertion and represents a set of conditions that exist along a continuum from less severe (heat exhaustion) to potentially life threatening (heat stroke).

Heat exhaustion is caused by the inability to maintain adequate cardiac output because of strenuous physical exertion and environmental heat stress.1,2 Acute dehydration often accompanies heat exhaustion but is not required for the diagnosis.3The clinical criteria for heat exhaustion include a core body temperature greater than 100.5 ºF/38 ºC and less than 104 ºF/40 ºC at the time of or immediately after exertion and/or heat exposure, physical collapse at the time of or shortly after physical exertion, and no significant dysfunction of the central nervous system. If any central nervous system dysfunction develops (e.g., dizziness or headache), it is mild and rapidly resolves with rest and cooling measures (e.g., removal of unnecessary clothing, relocation to a cooled environment, and oral hydration with cooled, slightly hypotonic solutions).1–4

Heat stroke is a debilitating illness characterized clinically by severe hyperthermia (i.e., a core body temperature of 104 ºF/40 ºC or greater), profound central nervous system dysfunction (e.g., delirium, seizures, or coma), and additional organ and tissue damage.1,4,5 The onset of heat stroke should prompt aggressive clinical treatments, including rapid cooling and supportive therapies such as fluid resuscitation to stabilize organ function.1,5 The observed pathologic changes in several organ systems are thought to occur through a complex interaction between heat cytotoxicity, coagulopathies, and a severe systemic inflammatory response.1,5 Multiorgan system failure is the ultimate cause of mortality due to heat stroke.5

Timely medical intervention can prevent milder cases of heat illness (e.g., heat exhaustion) from becoming severe (e.g., heat stroke) and potentially life threatening. However, even with medical intervention, heat stroke may have lasting effects, including damage to the nervous system and other vital organs and decreased heat tolerance, making an individual more susceptible to subsequent episodes of heat illness.6–8 Furthermore, the continued manifestation of multiorgan system dysfunction after heat stroke increases patients' risk of mortality during the ensuing months and years.9,10

Strenuous physical activity for extended durations in occupational settings as well as during military operational and training exercises exposes service members to considerable heat stress because of high environmental heat and/or a high rate of metabolic heat production.11,12 In some military settings, wearing needed protective clothing or equipment may make it biophysically difficult to dissipate body heat.13,14 The resulting body heat burden and associated cardiovascular strain reduce exercise performance and increase the risk of heat-related illness.11,15

Over many decades, lessons learned during military training and operations in hot environments as well as a substantial body of research findings have resulted in doctrine, equipment, and preventive measures that can significantly reduce the adverse health effects of military activities in hot weather.16–22 Although numerous effective countermeasures are available, heat-related illness remains a significant threat to the health and operational effectiveness of military members and their units and accounts for considerable morbidity, particularly during recruit training in the U.S. military.11,23 Moreover, with the projected rise in the intensity and frequency of extreme heat conditions associated with global climate change, heat-related illnesses will likely represent an increasing challenge to the military.24–26

In the U.S. Military Health System (MHS), the most serious types of heat-related illness are considered notifiable medical events. Notifiable cases of heat illness include heat exhaustion and heat stroke. All cases of heat illness that require medical intervention or result in change of duty status are reportable.4

This report summarizes reportable medical events of heat illness as well as heat illness-related hospitalizations and ambulatory visits among active component service members during 2020 and compares them to the previous 4 years. Episodes of heat stroke and heat exhaustion are summarized separately.


The surveillance period was 1 Jan. 2016 through 31 Dec. 2020. The surveillance population included all individuals who served in the active component of the Army, Navy, Air Force, or Marine Corps at any time during the surveillance period. All data used to determine incident heat illness diagnoses were derived from records routinely maintained in the Defense Medical Surveillance System (DMSS). These records document both ambulatory encounters and hospitalizations of active component service members of the U.S. Armed Forces in fixed military and civilian (if reimbursed through the MHS) treatment facilities worldwide. In-theater diagnoses of heat illness were identified from medical records of service members deployed to Southwest Asia or the Middle East and whose health care encounters were documented in the Theater Medical Data Store. Because heat illnesses represent a threat to the health of individual service members and to military training and operations, the Armed Forces require expeditious reporting of these reportable medical events through any of the service specific electronic reporting systems; these reports are routinely transmitted and incorporated into the DMSS.

For this analysis, a case of heat illness was defined as an individual with 1) a hospitalization or outpatient medical encounter with a primary (first-listed) or secondary (second-listed) diagnosis of heat stroke (International Classification of Diseases, 9th Revision [ICD-9]: 992.0; International Classification of Diseases, 10th Revision [ICD-10]: T67.0*) or heat exhaustion (ICD-9: 992.3–992.5; ICD-10: T67.3*–T67.5*) or 2) a reportable medical event record of heat exhaustion or heat stroke.27 Because of an update to the Disease Reporting System internet (DRSi) medical event reporting system in July 2017, the type of reportable medical events for heat illness (i.e., heat stroke or heat exhaustion) could not be distinguished using reportable medical event records in DMSS data. Instead, information on the type of reportable medical event for heat illness during the entire 2016–2020 surveillance period was extracted directly from the records of the DRSi. It is important to note that MSMR analyses carried out before 2018 included diagnosis codes for other and unspecified effects of heat and light (ICD-9: 992.8 and 992.9; ICD-10: T67.8* and T67.9*) within the heat illness category "other heat illnesses." These codes were excluded from the current analysis and the April MSMR analyses of 2018, 2019, and 2020. If an individual had a diagnosis for both heat stroke and heat exhaustion during a given year, only 1 diagnosis was selected, prioritizing heat stroke over heat exhaustion. Encounters for each individual within each calendar year then were prioritized in terms of record source with hospitalizations prioritized over reportable events, which were prioritized over ambulatory visits.

For surveillance purposes, a "recruit trainee" was defined as an active component service member (grades E1–E4) who was assigned to 1 of the services 8 recruit training locations (per the individual's initial military personnel record). For this report, each service member was considered a recruit trainee for the period corresponding to the usual length of recruit training in his or her service. Recruit trainees were considered a separate category of enlisted service members in summaries of heat illnesses by military grade overall.

Records of medical evacuations from the U.S. Central Command (CENTCOM) area of responsibility (AOR) (e.g., Iraq or Afghanistan) to a medical treatment facility outside the CENTCOM AOR were analyzed separately. Evacuations were considered case defining if affected service members had at least 1 inpatient or outpatient heat illness medical encounter in a permanent military medical facility in the U.S. or Europe from 5 days before to 10 days after their evacuation dates.

It should be noted that medical data from sites that were using the new electronic health record for the Military Health System, MHS GENESIS, between July 2017 and Oct. 2019 are not available in the DMSS. These sites include Naval Hospital Oak Harbor, Naval Hospital Bremerton, Air Force Medical Services Fairchild, and Madigan Army Medical Center. Therefore, medical encounter data for individuals seeking care at any of these facilities from July 2017 through Oct. 2019 were not included in the current analysis.


In 2020, there were 475 incident cases of heat stroke and 1,667 incident cases of heat exhaustion among active component service members (Table 1). The crude overall incidence rates of heat stroke and heat exhaustion were 0.36 and 1.26 per 1,000 person-years (p-yrs), respectively. In 2020, subgroup-specific incidence rates of heat stroke were highest among males, those less than 20 years old, Asian/Pacific Islanders, Marine Corps and Army members, recruit trainees, and those in combat-specific occupations (Table 1). The rates of incident heat stroke among Marine Corps and Army members were more than 9 times the rates among Air Force and Navy members. The incidence rate of heat stroke among female service members was 48.2% lower than the rate among male service members. There were only 19 cases of heat stroke reported among recruit trainees, but their incidence rate was more than 2 times that of other enlisted members and officers.

The crude overall incidence rate of heat exhaustion among females was 22.0% lower than the rate among males(Table 1). In 2020, compared to their respective counterparts, service members less than 20 years old, Asian/Pacific Islanders, Marine Corps and Army members, recruit trainees, and service members in combat-specific occupations had notably higher rates of incident heat exhaustion.

Crude (unadjusted) annual incidence rates of heat stroke increased steadily from 0.37 per 1,000 p-yrs in 2016 to 0.46 cases per 1,000 p-yrs in 2018 but then dropped to 0.41 cases per 1,000 p-yrs in 2019 and then to 0.36 cases per 1,000 p-yrs in 2020 (Figure 1). In the last year of the surveillance period, there were fewer heat stroke-related ambulatory visits than in any of the previous 4 years. Reportable medical events of heat stroke in 2020 (n=132) were the fewest since 2016 (n=93).

Crude annual rates of incident heat exhaustion were stable during 2016–2017, increased to a peak of 1.73 cases per 1,000 p-yrs in 2018, fell slightly in 2019, and then dropped sharply to the lowest value in the surveillance period, 1.26 per 1,000 p-yrs, in 2020 (Figure 2).

Heat illnesses by location

During the 5-year surveillance period, a total of 12,484 heat-related illnesses were diagnosed at more than 250 military installations and geographic locations worldwide (Table 2). Of the total heat illness cases, 6.2% occurred outside of the U.S., including 315 in Okinawa and 463 at 59 other locations in Europe, East Asia, Southwest Asia, Africa, and Cuba. Four Army installations in the U.S. accounted for slightly more than one third (34.0%) of all heat illnesses during the period: Fort Benning, GA (n=1,849); Fort Bragg, NC (n=971); Fort Campbell, KY (n=756); and Fort Polk, LA (n=674). Six other locations accounted for an additional one-quarter (26.5%) of heat illness events: Marine Corps Base (MCB) Camp Lejeune/Cherry Point, NC (n=1,050); Marine Corps Recruit Depot Parris Island/ Beaufort, SC (n=576); Naval Medical Center San Diego, CA (n=531); MCB Camp Pendleton, CA (n=467); Fort Hood, TX (n=365); and Okinawa, Japan (n=315). Of these 10 locations with the most heat illness events, 6 are located in the southeastern U.S. During the surveillance period, 20 locations had more than 100 cases each; together, these locations accounted for over three-quarters (76.6%) of all cases among active component members.

Heat illnesses in Iraq and Afghanistan

During the 5-year surveillance period, a total of 341 heat illnesses were diagnosed and treated in Iraq and Afghanistan (Figure 3). Of the total cases, 7.0% (n=24) were diagnosed as heat stroke. Deployed service members who were affected by heat illnesses were most frequently male (n=279; 81.8%); non-Hispanic white (n=204; 59.8%); 20–24 years old (n=188; 55.1%); in the Army (n=163; 47.8%); enlisted (n=330; 96.8%); and in repair/engineering (n=109; 32.0%) or combat-specific (n=85; 24.9%) occupations (data not shown). During the surveillance period, 3 service members were medically evacuated for heat illnesses from Iraq or Afghanistan; 2 of the evacuations took place in the summer months (May 2017 and July 2016) and 1 in Nov. 2020.

Editorial Comment

This annual update of heat illnesses among service members in the active component documented that the unadjusted annual rates of incident heat stroke and heat exhaustion peaked in 2018 and then declined in 2019 and 2020. In fact the crude annual incidence rates of heat stroke and heat exhaustion in 2020 represent the lowest rates of the 5-year surveillance period.

There are significant limitations to this update that should be considered when interpreting the results. Similar heat related clinical illnesses are likely managed differently and reported with different diagnostic codes at different locations and in different clinical settings. Such differences undermine the validity of direct comparisons of rates of nominal heat stroke and heat exhaustion events across locations and settings. Also, heat illnesses during training exercises and deployments that are treated in field medical facilities are not completely ascertained as cases for this report. In addition, it should be noted that the guidelines for mandatory reporting of heat illnesses were modified in the 2017 revision of the Armed Forces guidelines and case definitions for reportable medical events and carried into the 2020 revision.4 In this updated version of the guidelines and case definitions, the heat injury category was removed, leaving only case classifications for heat stroke and heat exhaustion. To compensate for such possible variation in reporting, the analysis for this update, as in previous years, included cases identified in DMSS records of ambulatory care and hospitalizations using a consistent set of ICD-9/ICD-10 codes for the entire surveillance period. However, it also is important to note that the exclusion of diagnosis codes for other and unspecified effects of heat and light (formerly included within the heat illness category "other heat illnesses") in the current analysis precludes the direct comparison of numbers and rates of cases of heat exhaustion to the numbers and rates of "other heat illnesses" reported in MSMR updates before 2018.

As has been noted in previous MSMR heat illness updates, results indicate that a sizable proportion of cases identified through DMSS records of ambulatory visits did not prompt mandatory reports through the reporting system.23 However, this study did not directly ascertain the overlap between hospitalizations and reportable events and the overlap between reportable events and outpatient encounters. It is possible that cases of heat illness, whether diagnosed during an inpatient or outpatient encounters, were not documented as reportable medical events because treatment providers were not attentive to the criteria for reporting or because of ambiguity in interpreting the criteria (e.g., the heat illness did not result in a change in duty status or the core body temperature measured during/ immediately after exertion or heat exposure was not available). Underreporting is especially concerning for cases of heat stroke because it may reflect insufficient attentiveness to the need for prompt recognition of cases of this dangerous illness and for timely intervention at the local level to prevent additional cases.

In spite of its limitations, this report demonstrates that heat illnesses continue to be a significant and persistent threat to both the health of U.S. military members and the effectiveness of military operations. Of all military members, the youngest and most inexperienced Marine Corps and Army members (particularly those training at installations in the southeastern U.S.) are at highest risk of heat illnesses, including heat stroke, exertional hyponatremia, and exertional rhabdomyolysis (see the other articles in this issue of the MSMR).

Commanders, small unit leaders, training cadre, and supporting medical personnel— particularly at recruit training centers and installations with large combat troop populations—must ensure that the military members whom they supervise and support are informed regarding the risks, preventive countermeasures (e.g., water consumption), early signs and symptoms, and first-responder actions related to heat illnesses.16–22,28–30 Leaders should be aware of the dangers of insufficient hydration on the one hand and excessive water intake on the other; they must have detailed knowledge of, and rigidly enforce countermeasures against, all types of heat illnesses.

Policies, guidance, and other information related to heat illness prevention and sun safety among U.S. military members are available online through the Army Public Health Center website at


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FIGURE 1. Incident casesa and incidence rates of heat stroke, by source of report and year of diagnosis, active component, U.S. Armed Forces, 2016–2020
FIGURE 2. Incident casesa and incidence rates of heat exhaustion, by source of report and year of diagnosis, active component, U.S. Armed Forces, 2016–2020
FIGURE 3. Numbers of heat illnesses diagnosed in Iraq/Afghanistan, active component, U.S. Armed Forces, 2016–2020

TABLE 1. Incident casesa and incidence ratesb of heat illness, by demographic and military characteristics, active component, U.S. Armed Forces, 2020

TABLE 2. Heat injury eventsa, by location of diagnosis/report (with at least 100 cases during the period), active component, U.S. Armed Forces, 2016–2020

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