More than 100 million Americans – about one in four adults – deal with seasonal allergies every year. Every March, urgent care clinics like ours fill up with people who aren’t sure if what they’re feeling is allergies, a cold, or COVID. Spoiler: for most people, it’s the trees.
Here’s something that might surprise you: seasonal allergies are actually a sign your immune system is working… just a little too hard. The same system designed to protect you from real threats has decided that tree pollen is the enemy. The symptoms are genuinely miserable, but the good news is they’re very manageable once you know what you’re dealing with.
Use this blog to:
- Decode your symptoms,
- Understand why allergies happen in the first place,
- Know when to handle it at home, and when to come in.
Jump to: What Seasonal Allergies Are High Right Now in March in SoCal?
Why Do People Get Seasonal Allergies?
The Hygiene Hypothesis
Here’s the surprising reason so many people deal with seasonal allergies today: our world is too clean. The “hygiene hypothesis” is a well-supported scientific theory. For most of human history, our immune systems were constantly exposed to bacteria, parasites, and pathogens. That exposure taught the immune system what was a real threat, and what wasn’t.
Today, we have cleaner living conditions. This means that our immune system does not encounter these “old environmental friends” as often as we grow up. Without that early training, our bodies can’t learn what to stand down for. The numbers back it up: far more kids have seasonal allergies today than a generation ago. So, it starts overreacting to harmless things like pollen, dust, and mold. The result is a rise in allergies, asthma, and autoimmune diseases in developed nations like the US.
The “Bored Antibody” Explanation
Everybody around the world produces what’s called “IgE antibodies.” These are our immune system’s first responders. IgE antibodies are triggered by parasites and pathogens in people without seasonal allergies.
The Global Proof: The Parasite Connection
Populations in parts of Africa and Asia have significantly lower rates of seasonal allergies. Researchers believe it’s because higher rates of parasitic infections keep their immune systems occupied fighting real threats.
Their bodies simply don’t have the bandwidth to declare war on tree pollen. It’s a strange tradeoff, but it reveals something important: seasonal allergies are largely a byproduct of cleaner, modern environments.
But for allergic individuals, these antibodies have essentially run out of real threats to fight. So when pollen, dust, or mold enters the picture, a “bored” IgE antibody misfires and treats the harmless substance as an invader. That inappropriate immune response is what triggers the sneezing, congestion, itching, and inflammation, a.k.a. an allergic reaction.
In other words: your immune system isn’t broken. It’s just a little too eager.
What Seasonal Allergies Are High Right Now in March in SoCal?
“March through April is the peak season for tree pollen, particularly from oak, cedar, and pine trees. By late April and May, grass pollen levels begin to rise, particularly from Bermuda grass.”
– Allermi
If you’re feeling it right now, you’re not alone. March kicks off one of the most active allergy windows of the year in Southern California, and the Irvine and Laguna Hills area is no exception. Here’s what’s actually in the air:
🌳 Pollen
Trees are the first to pollinate in early spring. Oak, birch, cedar, and elm trees begin releasing pollen as temperatures rise, often before leaves even appear. Pollen counts can spike dramatically on warm, windy days.
🍄 Mold Spores
As snow melts on the San Gabriel, San Bernardino, Santa Monica, Santa Ana, and San Jacinto mountains, the ground thaws. Outdoor mold thrives in the damp conditions. Mold is a major and often overlooked allergy trigger in March.
🕸️ Dust Mites
Our heating systems still run through early spring, and dust mites love cold snaps. The HVAC systems stir up dust mites and recirculate them through indoor air. This is a major aggravating factor for many allergy sufferers.
🐾 Pet Dander
During the winter-to-spring transition, homes stay sealed up to keep the warmth in. Consequently, pet dander and indoor allergens have nowhere to go. They accumulate, recirculate, and make an already tough allergy season worse.
Seasonal Allergy Symptoms: What to Expect
Seasonal allergy symptoms can range from mildly annoying to genuinely disruptive. Whether you suffer comes down to how your immune system learned to respond (or overrespond).
The tell-tale signs to watch for include:
- Runny nose, nasal congestion
- Sneezing (often in rapid, repeated fits)
- Itchy, watery, or red eyes
- Scratchy or irritated throat
- Skin irritation or hives
- Fatigue (more on this below)
Can Allergies Cause Fatigue?
Yes! This surprises many people. Allergy-related fatigue is real, and it’s one of the most underappreciated side effects of seasonal allergies. There are several reasons it happens:
1.
Allergy symptoms trigger a histamine response that deplete energy.
2.
Congestion and snoring disrupt sleep quality, leaving you unrested even after a full night.
3.
Mouth breathing from nasal congestion leads to lower-quality, sleep.
If you’re feeling unusually wiped-out during March, April, or May, it could be due to your immune system overreacting. Treating the underlying allergies often helps the fatigue improve.
How Long Do Seasonal Allergies Last?
This is one of the most common questions patients ask, and the honest answer is: it depends on the trigger.
🟤
February – April
Tree pollen season peaks across Southern California.
🟢
Late Spring – Early Summer
Grass pollen picks up, particularly Bermuda grass.
🟠
Through Fall
Mold and weed allergens can persist well into autumn.
Without treatment, allergy symptoms can last weeks to months. If your symptoms return at the same time each year, it’s highly likely you’re dealing with allergies rather than a virus.
Symptom Decoder: From Mild to Emergency
Not all allergic reactions are the same. Here’s a practical breakdown of the most common allergy-related conditions, what they look like, and what to do about them:
| Condition | Common Symptoms | What to Do |
|---|---|---|
| Allergic Rhinitis | Runny nose, sneezing, congestion, fatigue | 🟢 Manage at home |
| Allergic Conjunctivitis | Itchy, watery, red eyes | 🟢 OTC drops usually help |
| Allergic Rash / Hives | Itchy skin, mild swelling, redness | 🟡 Keep an eye on it and come see a doctor if spreading |
| Asthma Flare | Wheezing, chest tightness, mild shortness of breath | 🟡 See a doctor soon |
| Anaphylaxis | Throat swelling, can’t breathe, dizziness, rapid onset | 🔴 Call 911 immediately |
The most important takeaway from this table: the vast majority of allergy sufferers will land in the green zone. Anaphylaxis is rare, but knowing its signs could save a life.
Allergies vs. Cold vs. COVID: The Cheat Sheet
One of the most anxiety-producing aspects of spring symptoms is not knowing what you’re dealing with. Here’s a quick reference guide:
| Symptom | Allergies | Cold | COVID |
|---|---|---|---|
| Fever 😷 | Rare | Common | Common |
| Body Aches 🦴 | No | Common | Common |
| Itchy Eyes 👀 | Very common | Uncommon | Rare |
| Sneezing 🤧 | Frequent | Occasional | Occasional |
| Allergies | Cold | COVID | |
|---|---|---|---|
| Duration ⏰ | Weeks to months (seasonal) | 7–10 days | Varies |
| Pattern 🗓️ | Same time each year | Random | Random/exposure-based |
The single biggest differentiator?
Itchy eyes. If your eyes itch, it is almost certainly allergies. Viruses very rarely cause eye itching. Similarly, do your symptoms follow the same pattern every spring? Your immune system is likely responding to seasonal triggers, not a disease-causing microorganism.
That said, it is possible to have both allergies and a cold simultaneously, especially in spring. If you’re unsure, that’s exactly what urgent care is for.
How to Relieve Seasonal Allergies at Home
Good news: most people can get real relief with the right over-the-counter approach. Here’s where to start (tap the arrow icon to read more):
Antihistamines
Antihistamines block the histamine response that causes most allergy symptoms. For daily allergy management, second-generation antihistamines are generally the better choice:
Loratadine (Claritin) — once daily, non-drowsy, good for daytime use
Cetirizine (Zyrtec) — fast-acting, once daily, mild drowsiness in some people
Fexofenadine (Allegra) — non-drowsy, once or twice daily
Nasal Corticosteroid Sprays
Allergic rhinitis looks like congestion, runny nose, sneezing. Nasal steroid sprays are the most effective first-line treatment available over the counter. Options include Flonase (fluticasone) and Nasacort (triamcinolone). They work best when used consistently, starting a week or two before peak season if possible.
Is Benadryl good for seasonal allergies?
Benadryl (diphenhydramine) does work for allergy relief. But it’s a first-generation antihistamine that causes significant drowsiness and wears off quickly. It’s better suited for short-term, acute situations (like a sudden allergic reaction). It’s not great for managing daily seasonal symptoms. For ongoing spring allergy relief, the non-drowsy options above are more practical.
Eye Drops
Allergic conjunctivitis looks like itchy, watery eyes. Antihistamine eye drops like Zaditor or Alaway can provide quick, targeted relief here.
How to Treat Seasonal Allergies: When to Step Up Care
Are Over The Counter (OTC) medications just not cutting it? When drug store meds don’t offer enough relief and symptoms impact your quality of life, we can help. A provider at Sand Canyon Urgent Care can help you explore prescription and long-term treatment options. We can offer more targeted treatment options for severe seasonal allergy symptoms.
Treatments for Severe Seasonal Allergies
- Prescription antihistamines: stronger formulations for more severe reactions.
- Prescription nasal sprays include combination sprays that address both congestion and inflammation.
- Leukotriene inhibitors (e.g., Montelukast/Singulair): prescription medications that target a different inflammatory pathway. This is particularly helpful if asthma is involved.
- Allergy testing: skin or blood tests identify your specific triggers, enabling targeted treatment.
- Immunotherapy (allergy shots or sublingual drops): the only treatment that addresses the root cause over time. It gradually desensitizes the immune system to specific allergens.
Have you been managing your symptoms with OTC medications for years without meaningful relief? Allergy testing and immunotherapy may be worth discussing with a physician.
When to Visit Urgent Care
Most seasonal allergy symptoms can be managed at home, but some situations call for professional evaluation. Consider visiting Sand Canyon Urgent Care if:
- Symptoms haven’t improved after 1–2 weeks of OTC treatment
- You’re not sure if you’re dealing with allergies, a sinus infection, or something else
- OTC medications aren’t providing adequate relief
- A rash is spreading, worsening, or accompanied by fever
- You’re experiencing shortness of breath that feels off but isn’t an emergency
- Congestion has progressed to facial pain or pressure (possible sinusitis)
- You need help identifying your triggers or developing a treatment plan
No appointment necessary. Our team can help you figure out what you’re dealing with and get you on the right path to feeling better — fast.
Anaphylaxis can develop within minutes of exposure to a trigger. If you’ve experienced a severe allergic reaction in the past, talk to a doctor. We may recommend that you carry an epinephrine auto-injector (EpiPen).
Breathe Easy. You’ve Got This
Spring allergies are frustrating, exhausting, and genuinely disruptive to daily life. But they’re also one of the most manageable chronic conditions out there.
The bottom line? Itchy eyes, predictable sneezing, and symptoms that vanish by summer? That’s seasonal allergies. Stock up on a good non-drowsy antihistamine. Try a nasal spray and watch pollen counts. Know that the vast majority of what you’re feeling is a completely normal immune system overreaction, not a medical crisis.
But when you’re not sure, or when symptoms aren’t responding to treatment, Sand Canyon Urgent Care is here. No appointment needed.
Walk In. Feel Better.
Sand Canyon Urgent Care is open seven days a week. No appointment needed. From diagnosis to treatment, we’ll help you get ahead of your allergies for good.View Appointment Times
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