Hayfever affects around one in ten adults, and an even higher proportion of children and teenagers. Chronic symptoms may lead to poor concentration, impaired learning ability and school absenteeism in children, amongst other problems. In the run-up to the hayfever season, therefore, it is important to identify teenagers or young adults with persistent or severe hayfever symptoms and to treat their symptoms aggressively to prevent poor performance at school and in examinations. Given that approximately 80% of patients with asthma also have rhinitis, asking your asthma patients about their possible hayfever symptoms is a good starting point.