How allergies can develop later in life

Allergies can first appear in adulthood after infections, antibiotic use, hormonal changes, or tick bites alter the immune system. Although some treatments can control reactions and researchers are exploring ways to retrain immunity, many sudden-onset allergies may be permanent.

感染、使用抗生素、激素变化或蜱虫叮咬都可能改变免疫系统，使人到成年后才首次出现过敏。虽然部分疗法能够控制过敏反应，研究人员也在探索重新训练免疫系统的方法，但许多突然出现的过敏可能会伴随终身。