The Armed Forces Health Surveillance Division plays a critical role in force health protection. As the central epidemiologic resource for the U.S. Armed Forces, AFHSD conducts medical surveillance to protect all those who serve our nation in uniform and allies who are critical to our national security interests.

The Medical Surveillance Monthly Report, a peer-reviewed journal launched in 1995, is the Armed Forces Health Surveillance Division's flagship publication. The MSMR provides monthly evidence-based estimates of the incidence, distribution, impact, and trends of health-related conditions among service members.

Since 2001, MSMR has published regular updates on the incidence of heat illness among U.S. active component service members. This update presents summaries of heat stroke and heat exhaustion case counts, incidence rates, and locations between 2020 and 2024.

This annual update provides more recent data on the incidence of exertional hyponatremia, a condition in which water and electrolytes lost during or after heavy exertion are replaced only by water, which can lead to death or serious morbidity if left untreated.

This annual update provides more recent data on the incidence of exertional rhabdomyolysis, a pathologic muscle breakdown associated with strenuous physical activity.

This letter to the editor addresses the methodology from the article Correlation Between Mean Temperature and Incidence of Tick-borne Diseases Among Active Duty Service Members in the Contiguous U.S., 2000-2023, published in the March 2025 issue of MSMR.

MSMR publishes a monthly update of reportable medical events for both active component members and Military Health System beneficiaries. Military Health System care providers and public health officials document reportable medical events through the Disease Reporting System internet.

This editorial from the U.S. Army Research Institute of Environmental Medicine discusses increased research focus on the female warfighter, to improve knowledge and awareness of individualized risk management for individuals exposed to extreme terrestrial environments, both in mission-critical scenarios as well as training.

This descriptive study examines and characterizes unintended pregnancies diagnosed after long-acting reversible contraception placement in active duty service women, including pregnancy due to long-acting reversible contraception failure as well as undetected pregnancies.

This Surveillance Snapshot reports on mid-season analysis by the Department of Defense Global Respiratory Pathogen Surveillance Program of influenza vaccine effectiveness for the 2024-2025 influenza season.

This editorial discusses women’s health research initiatives funded by the Congressionally Directed Medical Research Programs, a funding organization within the Defense Health Agency that supports research on more than 90 diseases, conditions, and topics directed by Congress.

This update of infertility surveillance, analysis and reporting provides more recent estimates of infertility diagnosis incidence and prevalence of among active component U.S. service women. MSMR has published the incidence and prevalence of diagnosed female infertility among active component women since 2000, with assessments of annual rates of ...

This report on sepsis hospitalizations among service women is in response to studies of sepsis among active component U.S. military members that have shown markedly increased rates of sepsis hospitalizations, especially among women, among whom rates are higher than male service members as well as the general U.S. population.

This report highlights trends in birth control methods self-reported by female active duty sailors and marines, providing insights into service women’s birth control preferences and behaviors in addition to available clinical data.