What causes seasonal allergies? I'm Dr. Manan Shah, I'm an ENT and allergist with Wyndly Health. Seasonal allergies happen when your body has a reaction to pollen.
So this can be from trees, grasses, or weeds. And what happens is your body releases histamine which causes you to sneeze, have nasal congestion, and just feel terrible.
The good news is you can treat this using over-the-counter antihistamines, topical nasal sprays, or immunotherapy. Immunotherapy is the only way to fix it for the long term.