Same pollen count, worse symptoms. There's a reason September hits harder than April.

Hi,

If your allergies feel worse in the fall than they do in spring, you're not misremembering. It's a real pattern, and there's a physiological explanation for it that most people have never heard.

Ragweed season is starting right now. It peaks in September and runs until the first hard frost. Understanding why this stretch feels so much worse than spring is the difference between getting ahead of it and spending six weeks miserable.

Your immune system has been working since February

Here's the part that explains almost everything.

By the time ragweed arrives in August, your immune system has been responding to allergens continuously for six or seven months — tree pollen in late winter, grass pollen through early summer, mold spores all summer long.

That sustained activity lowers your histamine threshold. Your baseline inflammatory state is already elevated before ragweed releases a single grain. So a pollen count in September that would have been manageable in April lands on a system that's already been running hot for half a year.

The count is the same. Your capacity to absorb it isn't.

Two allergens instead of one

Spring is mostly a single-allergen season — trees, then grass. Fall is not.

Ragweed peaks at the same time outdoor mold spore counts hit their annual high, as decaying late-summer vegetation creates ideal conditions for mold. For anyone sensitized to both — a common combination — September delivers a double exposure that spring simply doesn't produce.

This is why people who consider themselves "spring allergy people" often get blindsided in the fall. They're treating for one allergen while reacting to two.

The window closes in about three weeks

Ragweed pollen is one of the most potent allergens there is. A single plant releases roughly a billion pollen grains in a season, and those grains travel up to 400 miles on the wind — which means you can react severely without a ragweed plant anywhere near your home.

Allergists recommend starting treatment two to three weeks before peak exposure. With ragweed peaking in September, that window is open now and closes at the end of the month.

The reason timing matters: once your nasal passages are inflamed, medication has to work backward against established inflammation rather than preventing it. Starting early isn't a minor optimization. It's the difference between medication working and medication barely helping.

Three things that make a measurable difference

• Start now, not when symptoms appear. Nasal corticosteroids need roughly two weeks of consistent use to reach full effect.

• Avoid mid-morning outdoor exposure. Ragweed pollen release peaks between roughly 10 AM and noon. Early morning and evening are meaningfully lower.

• Be careful around thunderstorms. The gusts preceding a storm disperse accumulated pollen, and there's evidence storms rupture pollen grains into smaller fragments that reach deeper into the airways. Emergency visits for asthma and allergy symptoms spike during and just after significant storms.

What testing changes

If you've spent years cycling through antihistamines with diminishing returns, the problem usually isn't the medication. It's that nobody has identified what you're actually reacting to.

A blood allergy test identifies the specific pollens, molds, dust mites, and animal proteins your immune system responds to. That result determines whether your fall symptoms are ragweed, mold, both, or something else entirely — and what treatment makes sense as a result.

Our board-certified allergists order the test, review the results with you on a video visit, and build the plan from there. Everything happens from home, and there's no waitlist.

What it costs

HeyAllergy accepts Medicare and most major PPO plans: United Healthcare, Anthem Blue Cross, Blue Shield, Cigna, Aetna, Humana, Oscar, and Tricare. For most insured patients, a telemedicine consultation costs the same as a specialist copay — often $0 to $50.

Want your exact number before committing to anything? Call your insurer with our Tax ID 85-0834175 and ask about telemedicine benefits for allergy and immunology. Five-minute call.

The longer-term fix

Antihistamines manage symptoms for the day. They don't change how your immune system responds, which is why the same routine works less well each year as exposure accumulates.

HeyPak® is sublingual immunotherapy — custom-mixed drops taken under the tongue daily, formulated from your specific test results, shipped to your door. It gradually retrains your immune system to tolerate the allergens triggering you, including ragweed and mold if those are on your results.

It starts at $47/month. Most patients notice improvement in 3–6 months, and treatment runs 3–5 years for lasting relief.

If you're not sure whether your fall symptoms are ragweed, mold, or something else, reply to this email and tell us what you experience and when. Someone on our team reads every reply, and clinical questions go to one of our allergists.

Talk soon,
The HeyAllergy Team
Dr. Krikor Manoukian, MD, FAAAAI, FACAAI — Medical Director