Immune system triggers can cause new allergies in adulthood

Medical experts are clarifying that allergies can develop at any stage of life, including adulthood, rather than being strictly limited to childhood or genetic predisposition. While genetics play a role, researchers have identified various environmental triggers that can activate the immune system.

One significant trigger is the alpha-gal syndrome, which is caused by tick bites. Ticks can transmit a sugar molecule called alpha-gal into the human bloodstream. Because humans lost the ability to produce this molecule millions of years ago, exposure can cause the immune system to react to it, leading to allergies to mammalian products like lamb.

Additionally, viral infections such as COVID-19, respiratory syncytial virus (RSV), and rhinovirus can act as triggers. Research indicates that COVID-19 may increase the risk of developing allergic rhinitis and asthma due to heightened inflammation. Studies suggest that while the infection increases these risks, vaccination may help decrease them.