Hay Fever and Allergies: Why Millions of Germans Suffer - Germany's Hay Fever Crisis Worsens as Ragweed Spreads Due to Climate Change

Hay fever, also known as allergic rhinitis, is becoming a significant issue in Germany, with 12 million people now affected. The situation worsened in 2024 as common ragweed, a highly allergenic plant, spread rapidly across the country. Experts link this surge to warmer weather and shifting climate patterns.

Since 2020, common ragweed—known scientifically as Ambrosia artemisiifolia—has spread aggressively in Germany. The plant thrived in 2023 and 2024 due to milder winters and favorable weather. Regions like Baden-Württemberg's Rhine Valley, Lake Constance, and parts of Bavaria, Rhineland-Palatinate, and North Rhine-Westphalia saw the biggest increases.

Climate change is making pollen seasons longer and more intense. Warmer temperatures allow pollen to travel further and become more aggressive. Air pollution, including fine dust and nitrogen oxides, also worsens inflammation in hay fever sufferers.

Genetics influence who develops allergies, with children of allergic parents facing higher risks. But lifestyle factors play a role too. Studies suggest that exposure to dirt and microbes—common in farm-raised children—can lower allergy rates. Meanwhile, diets heavy in fast food may increase sensitivity, while vegetable-rich meals could ease symptoms.

Epigenetics adds another layer, as environmental factors can alter how genes respond to allergens. This means pollution, diet, and even stress might change a person's likelihood of developing hay fever over time.

The spread of ragweed and longer pollen seasons point to a tougher future for hay fever sufferers. Without intervention, rising temperatures and pollution will likely make allergies more common and severe. Public health measures and awareness campaigns may be needed to address the growing impact.