Japanese hop (Humulus japonicus) is an invasive climber that flowers in late summer, releasing pollen that can cause allergic reactions. This pollen significantly contributes to seasonal allergies, particularly affecting those who are sensitive, with symptoms often intensifying in urban areas where the plant is more abundant.
Consider testing for a Japanese hop allergy if you have allergy symptoms in late summer that do not coincide with other known allergies or triggers.
To manage symptoms, avoid outdoor activities when pollen counts are high, use air purifiers indoors, and follow medical advice for taking allergy medications.
An allergic reaction to Japanese hop occurs when the immune system identifies its pollen as a threat, leading to the release of histamine and other chemicals that cause allergy symptoms.