Hay Fever and Allergies: Why Millions of Germans Suffer - Why Hay Fever Is Surging in Germany—and How Climate Change Fuels It

Hay fever now affects around 12 million people in Germany. The condition is becoming more widespread as climate change and lifestyle factors alter pollen patterns. Experts point to longer seasons, aggressive pollen strains, and dietary influences as key drivers behind the rise.

The spread of hay fever has deep roots in both genetics and environment. Children with allergic parents face a higher risk, as inherited traits influence sensitivity. Yet epigenetics also plays a role—environmental exposures can switch genes on or off, passing heightened risks across generations.

Climate shifts have worsened the problem. Milder winters now trigger earlier and longer pollen seasons, while rising CO₂ levels and heat make pollen more potent. Air pollution from fine particles, ozone, and nitrogen oxides further inflames allergic reactions. These conditions have also helped invasive species thrive, particularly Ambrosia artemisiifolia, or common ragweed. First recorded in Germany in the late 19th century, its pollen can travel hundreds of kilometres, spreading the plant's reach. In 2024 alone, ragweed growth surged by 500 percent compared to the previous year.

Diet and early-life exposure also shape allergy risks. Frequent fast food consumption appears to increase susceptibility, while vegetable-rich diets may ease symptoms. Conversely, children raised on farms—exposed to dirt and microbes—show lower allergy rates, suggesting that early contact with natural environments builds resilience.

The combination of genetic predisposition, climate change, and modern lifestyles is making hay fever more common and severe. With pollen seasons extending and invasive plants spreading, the number of sufferers in Germany is likely to grow. Researchers continue to study how diet, pollution, and early environmental exposure could help manage or even reduce the condition's impact.