National Health Observances 2025 Calendar. Global health observances are designated days, weeks, or months dedicated to raising awareness and mobilizing action on key health issues worldwide. National health observances (nhos) are special days, weeks, and months dedicated to raising awareness about important health topics.
Each month, we feature select national health observances (nhos) that support our mission to improve health across the united states. This list presents national and international health awareness days.