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Mexico Sees Early Surge in Heat Stroke Cases as IMSS Reports 133% Rise

Health officials warn the surge signals an expanded early heat season straining prevention efforts.

IMSS refuerza medidas preventivas y de atención, ante el incremento en el número de casos de personas que hay sufrido golpe de calor en la presente temporada. Advierte que en lo que va del año se han atendido 133 casos, cifra superior a los 57 registrados en el mismo periodo de 2025

Overview

  • The Ministry of Health (SSA) reported on May 20 that Mexico has 543 people affected by heat illness and 14 confirmed deaths, all attributed to heat stroke.
  • The Instituto Mexicano del Seguro Social (IMSS) recorded 133 heat‑stroke patients so far in 2026 compared with 57 in the same period of 2025, a 133% increase.
  • Cases are concentrated in hot states with Tabasco accounting for about 40% of IMSS heat‑stroke patients, and the number of states reporting heat deaths has risen to 11 from five a year earlier.
  • IMSS has activated a nationwide 'Comando Onda de Calor' to coordinate 24/7 clinical care and intensified surveillance while urging simple prevention steps such as drinking water, avoiding sun between 11:00 and 16:00, and seeking care at first warning signs.
  • Authorities say children under five and older adults are most at risk and warn that the earlier, larger surge could increase hospital demand during the heat season, so prompt treatment and local prevention are key to limiting more deaths.