What is Ragweed and Why Does it Cause Allergies? 

Bobbie Byrd

September 1, 2025

AllergiesAllergy

ragweed allergies

Late Summer Sneezes: Why This Season is Tough for Allergy Sufferers 

If you find yourself sneezing, sniffling, and rubbing your itchy eyes just as summer is winding down, you’re not alone, and you’re not imagining things. Late August through October is ragweed season, one of the biggest triggers of hay fever in the United States. Every year, millions of people brace themselves for weeks of congestion, scratchy throats, and fatigue, all thanks to a tiny but powerful plant. 

Let’s break down what ragweed is, why it causes such a reaction, and what you can do to feel better. 

What Exactly Is Ragweed? 

Ragweed is a weed that belongs to the daisy family, and it’s surprisingly common. There are about 17 different species of ragweed in the U.S., and they thrive in many regions, especially in the Midwest, the South, and areas with open fields, rural roadsides, or even neglected gardens. 

Here’s the tricky part: the problem isn’t the plant itself, it’s the pollen. One ragweed plant can release up to a billion pollen grains in a single season. And because these grains are tiny and lightweight, the wind can carry them for hundreds of miles. This means that even if ragweed isn’t growing in your backyard, you can still be affected by its pollen. 

Why Does Ragweed Pollen Trigger Allergies? 

For people with ragweed allergies, their immune system treats pollen like an enemy invader. When pollen grains are inhaled, the body responds by releasing histamine and other chemicals meant to “protect” you. Unfortunately, this defense mechanism causes inflammation in your nose, eyes, and airways leading to the all-too-familiar allergy symptoms. 

That’s why ragweed season brings on runny noses, itchy eyes, and sneezing fits. For some, it can even trigger asthma flare-ups, making it harder to breathe and increasing coughing or wheezing. 

Common Symptoms of Ragweed Allergy 

Ragweed allergies often feel a lot like a lingering summer cold, but the symptoms can drag on for weeks or even months. Common signs include: 

  • Sneezing 
  • Runny or stuffy nose 
  • Itchy, watery, or red eyes 
  • Scratchy throat or ears 
  • Sinus pressure or headaches 
  • Fatigue or “brain fog” 
  • Worsening asthma (wheezing, coughing, shortness of breath) 

If you notice these symptoms every year around the same time, ragweed may be the reason. 

Is It Ragweed or Something Else? 

It’s not always easy to tell whether your symptoms are due to allergies, a cold, or even something like COVID-19. Here are a few helpful clues: 

  • Timing: Ragweed allergies usually flare up late summer through fall, while colds can happen anytime. 
  • Fever: Allergies don’t cause fever – if you have one, it’s likely an infection. 
  • Duration: Allergy symptoms can last for weeks or months, while colds typically clear in about 7–10 days. 
  • Pattern: If you notice your symptoms are worse outdoors or on high-pollen days, ragweed is a likely culprit. 

Still not sure? Allergy testing is the most reliable way to know exactly what’s causing your symptoms. 

Don’t Suffer Through Ragweed Season 

The good news: you don’t have to just put up with ragweed every year. An allergist can help you take control by: 

  • Confirming your triggers with allergy testing 
  • Recommending medications that actually work for you 
  • Offering long-term relief through allergy shots or drops (immunotherapy) 

With the right plan, you can enjoy the changing seasons without spending every day battling sneezes and congestion. 

 Don’t let ragweed hold you back this fall. Schedule an appointment with our team today and breathe easier all season long.

This entry was posted in Allergies, Allergy on September 1, 2025 by Bobbie Byrd.

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