If your allergies feel different this year, you’re not imagining it. We’ve written this every year for the last few, because weird weather patterns have generally been making allergy symptoms worse for most of us. This year, things are a little more complicated for allergy sufferers.

Some people who usually suffer are getting a bit of a break. Others who typically breeze through spring are suddenly wondering why their eyes itch and their nose won’t cooperate. Once again, allergy season has decided not to follow the script.

So, what’s new in 2026? A few things, and they all come down to how unpredictable weather has become.

During the past year, we’ve seen more sharp swings between warm and cold, wet and dry. The Northeast had a particularly cold winter. Western states were especially warm and dry. That matters because plants are extremely responsive to these changes. A warm stretch can trigger early pollen release. A sudden cold snap can pause things. Then another warm-up hits and everything blooms at once.

The result is what allergy specialists are calling a “burst season.” Instead of a slow, steady rise in pollen, we’re seeing shorter, more intense spikes. Translation: fewer weeks of mild annoyance, more days where it feels like your sinuses have declared a state of emergency.

Geography is shifting too. In recent years, the South and parts of the West have carried the heaviest burden thanks to heat, moisture, and longer growing seasons. That trend continues. But this year, parts of the Midwest and Northeast are seeing more variability. A cooler winter in some areas delayed early pollen, but rapid warming has compressed the season into a tighter, punchier window.

In plain English: you may have fewer bad days overall, but the bad days may feel worse.

What is actually happening in our bodies during a burst season?

During a typical allergy season, pollen levels rise gradually. Your immune system has time to ramp up, react, and in some cases even partially adapt. In a “burst” season, that slow ramp disappears. Instead, your body gets hit with a sudden, concentrated dose of allergens over a short period of time.

First, your immune system is on high alert. If you have seasonal allergies, your body already recognizes pollen as a threat, even though it isn’t one. You have IgE antibodies sitting on the surface of immune cells, like mast cells, essentially waiting for pollen to show up.

When a burst of pollen hits, a lot of those allergens enter your nose, eyes, and airways at once. That means more IgE antibodies get triggered simultaneously.

This leads to a rapid “degranulation” of mast cells. In other words, those cells dump out a surge of chemicals, especially histamine.

Histamine is what causes the classic symptoms:

• Blood vessels dilate, which leads to redness and swelling.
• Nerve endings get irritated, which causes itching.
• Mucus production ramps up, which leads to congestion and a runny nose.
• Because this is happening all at once, symptoms can feel more intense than usual.

Second, inflammation ramps up faster and more aggressively. It’s not just histamine. Your body also releases other inflammatory signals like leukotrienes and cytokines. These recruit more immune cells to the area, which amplifies swelling in your nasal passages and airways.

In a slower season, this process builds gradually. In a burst season, it spikes quickly. That’s why people often say, “I was fine yesterday and miserable today.”

Third, your body doesn’t get much time to regulate the response. With gradual exposure, some people experience a mild “dampening” effect over time. In a compressed season, the immune system is constantly being re-triggered before it can settle down.

There’s also a mechanical factor. High pollen days often mean more particles physically landing on your eyes, skin, and respiratory tract. That alone increases irritation, even before the immune system fully kicks in.

Put it all together, and a burst season is essentially a bigger exposure, a faster immune reaction, a stronger inflammatory response, and less recovery time in between.

There’s also something else happening that doesn’t get talked about enough. Air quality and allergies are starting to overlap. Smoke from wildfires, urban pollution, and even high ozone days can irritate your airways and make your body more reactive to pollen. So even if pollen counts are technically “moderate,” your symptoms may feel anything but.