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Due to climate change, people are more allergic to ragweed pollen, says the doctor

Allergy symptoms are stronger in good weather

Allergy symptoms are stronger in good weather

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Allergist and immunologist Radka ŠediváAllergist and immunologist Radka ŠediváSource: with the permission of Radka ŠediváEven in the Czech Republic, climate changes are showing up. You can see it in the fact that the lilac bloomed much earlier than usual. Some places have been smelling it outside for weeks. It manifests itself somehow on allergies?
Of course yes. With the warm weather, nature also woke up earlier, and thus the pollen allergy season started earlier.

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Radka Šedivá, doctor

Graduate of the 1st Faculty of Medicine of Charles University in Prague, specializing in internal medicine, allergology and clinical immunology.

Previously, she worked in internal departments in hospitals in Nymburk and Městec Králové. She is now an ambulatory specialist in allergology and clinical immunology at Synlab, where she also serves as the head doctor of outpatient clinics and consulting rooms.

She is a member of the Czech Society of Allergology and Clinical Immunology and the Czech Society of Vaccinology.

After winter, hazel and alder allergies are usually the first to appear around mid-February. Was it the same this year? Or was it caused by climate change?
This year, the first pollen grains of hazel began to appear in lower locations already in mid-January, at the end of the month their quantity increased rapidly, and at the beginning of February hazel pollen dominated the air and alder pollen began to be added. So this year, the pollen season started already at the end of January, the allergens remained the same.

It is possible that the “calendar” of allergies in connection with climate change will it move somehow?
In connection with the warming and extension of the growing season of plants, an earlier onset of the pollen season can be assumed, as well as its extension.

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Are there new plants that people may be allergic to?
Climate change is also related to vegetation change. An allergy to ambrosia pollen, which was more typical for more southern states, manifests itself to a greater extent here. With the gradual increase in plants of non-domestic origin, the development of other allergies can also be assumed.


A genus of more than forty plants from the Asteraceae family. It originates from North America, from where it spread throughout the world. There are three species in the Czech Republic: ambrosia lisokolasá, ambrosia feather-leaved and ambrosia trojklaná. Some allergy sufferers can be sensitive to the plant, it can cause them, for example, hay fever. Gray-green feather-leaved ambrosia, whose stem is around 150 centimeters long, is particularly invasive.

Ambrosia versus root vegetables

There are also so-called cross allergies, when the body can confuse, for example, ragweed with root vegetables. Based on their biological similarity. In short, a person can feel unpleasant allergic symptoms after consuming root vegetables, even if he is not allergic to them. Whether it is a cross-allergy, however, must be determined by a doctor.

Its typical symptom is the so-called oral allergy syndrome. With it, the allergic person itches on the tongue or in the throat, or his throat and lips may swell, and the skin of the face and ears may itch. Problems often don’t last long.

In addition to the oral allergy syndrome, cross-allergy can also be manifested by skin eczema, sneezing and tearing. In very rare cases, the patient may be at risk of anaphylactic shock. According to allergist Radka Šedivá, the most important thing is to know your problems and ideally prevent them.

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