Sixty-six percent of Americans planned a summer vacation in 2025 — and with that comes a predictable wave of travel-related health issues. From road trips through the Midwest to international flights to Mexico and Europe, summer travel exposes Americans to new environments, unfamiliar foods, altitude changes, and elevated infection risks.

For roughly 81 million Americans living with seasonal allergic rhinitis, summer is not all fun in the sun. Between June and August, grass pollen (which peaks in early summer) gives way to weed pollen — and for many allergy sufferers, the sneezing, itching, and congestion just never fully stops.

The United States experiences some of the most intense summer heat on the planet — from the scorching deserts of Arizona to the humid bayous of Louisiana. Every summer, heat-related illness sends thousands of Americans to emergency rooms, and many more suffer at home without knowing when they cross the line from manageable discomfort to a medical emergency.

Every summer, millions of Americans spend too long outdoors and end up red, tender, and miserable. Sunburn is one of the most common summer health complaints — and also one of the most commonly undertreated. Most people reach for aloe and hope for the best, but depending on severity, sunburn can warrant a physician’s attention.