The surprising health condition some people develop after moving to Australia

Key points

• Some migrants develop hay fever years after moving to Australia, even if they never had it before. Nearly one in four Australians has the condition, according to the Australian Institute of Health and Welfare.
• Sydney doctor Jason Yu says allergies can appear at any stage of life, though they often start in childhood. He said exposure to new allergens, such as dust mites and grass pollen, may be one factor.
• Hay fever and asthma are closely related, and Yu urged anyone short of breath to see a doctor promptly.