Fall Allergies Are Especially Bad Right Now — Here's How to Deal Starting late August and moving through October, fall seasonal allergies are largely due to pollen from weeds, including the infamous ragweed. Ragweed, or hay fever, can produce up toa billion grains of pollen per plant that can be carried for literally hundreds of miles by wind. Regardless of what you're allergic to, you'll likely experience the same common allergy symptoms like a runny nose, itchy eyes, and sinus pressure. Pollen allergies can cause inflammationand pain, but changing temperatures canalso be responsible for seasonal headaches. In addition to cleaning for pollen andmold, fall allergy symptoms can usually be managed with over-the-counter products. If these measures aren't enough, talkto your doctor about allergy testing toform a more tailored treatment plan.