Hay Fever and Allergies: Why Millions of Germans Suffer - Germany's Hay Fever Crisis Worsens as Ragweed Spreads and Pollen Seasons Lengthen

Hay fever, also known as allergic rhinitis, is becoming a growing concern in Germany, with approximately 12 million people now affected. Rising temperatures, air pollution, and invasive plant species like the common ragweed are exacerbating symptoms and extending allergy seasons. New research indicates that lifestyle and genetic factors also contribute to allergy risks.

Climate change has intensified pollen production and extended allergy seasons. Milder winters mean pollen appears earlier and lingers longer. Heat, pollution, and higher CO₂ levels make pollen more aggressive, increasing its potency.

Common ragweed, a highly allergenic plant, has rapidly spread in Germany. Since 2020, its presence has surged, particularly in wine and farmland regions like Rheinland-Pfalz, Baden-Württemberg, Hessen, and Bavaria. In 2024 alone, growth jumped by 500 percent compared to the previous year. Poor control measures and favorable weather have allowed the plant to thrive.

Air pollution adds to the problem. Fine particles, ozone, and nitrogen oxides irritate airways and worsen hay fever symptoms. Genetic factors also matter—children with allergic parents face a higher risk. But environment plays a part too: early exposure to dirt and microbes, such as on farms, appears to lower allergy rates. Meanwhile, diets heavy in fast food may increase risks, while vegetable-rich meals could ease symptoms.

Epigenetic changes, like those caused by smoking during pregnancy, can even pass hay fever risks to future generations.

The combination of climate shifts, invasive plants, and pollution is making hay fever more widespread and severe. With ragweed spreading fast and pollen seasons lengthening, experts expect allergy cases to keep rising. Preventive measures, from diet to environmental controls, may help reduce the impact on public health.