Hay fever causes a predictable cluster of symptoms: sneezing, a runny or stuffy nose, itchy and watery eyes, and an irritating tickle in the throat. These symptoms can last six weeks or longer during pollen season, which is one of the clearest ways to tell hay fever apart from a common cold. Roughly 10 to 20 percent of children experience hay fever, and it’s similarly common in adults.
Core Symptoms of Hay Fever
The hallmark symptoms center on the nose and eyes. You’ll typically notice repeated sneezing, a nose that runs with thin, clear mucus, and congestion that makes it hard to breathe through one or both nostrils. Your eyes may itch, water, and look red or puffy. Many people also feel an itch in the roof of their mouth, the back of the throat, or inside their ears.
These symptoms happen because your immune system overreacts to something harmless, like pollen. When pollen lands on the lining of your nose, specialized immune cells release histamine and other inflammatory chemicals. Histamine widens blood vessels (causing congestion), triggers mucus production (the runny nose), and irritates nerve endings (the itching and sneezing). It’s essentially your body deploying a full defense response against something that poses no real threat.
How It Differs From a Cold
Hay fever and the common cold share several symptoms, especially sneezing, a stuffy nose, and a sore throat. But there are reliable ways to tell them apart:
- Duration: Colds rarely last more than two weeks. Hay fever symptoms persist as long as you’re exposed to the allergen, often six weeks or more during a pollen season.
- Itchy, watery eyes: This is a strong signal of hay fever. Colds almost never cause eye itchiness.
- Fever: Hay fever never actually causes a fever, despite the name. Colds sometimes do, and the flu usually does.
- Body aches: Hay fever doesn’t cause muscle pain or general achiness. If you feel sore all over, you’re more likely dealing with a cold or flu.
- Mucus color: Hay fever produces thin, clear, watery discharge. A cold often starts clear but turns thicker and yellowish after a few days.
One practical test: think about when your symptoms started. If they appeared right after you spent time outdoors on a warm, breezy day and disappeared once you went inside, that pattern points strongly toward hay fever.
Symptoms in Children
Children experience the same core symptoms as adults, but they also show some distinctive physical signs. Kids with hay fever often develop dark circles under their eyes, sometimes called “allergic shiners,” caused by congestion in the small blood vessels beneath the skin. They may also develop a visible crease across the bridge of their nose from repeatedly pushing it upward with the palm of their hand to relieve itching or open their airway.
Chronic mouth breathing is another telltale sign. A child whose nose is constantly blocked may sleep with their mouth open, snore, and wake up with a dry throat. Because young children can’t always describe what they’re feeling, parents often notice the behavioral clues first: rubbing the nose and eyes, being unusually cranky, or sleeping poorly.
When Symptoms Appear and What Triggers Them
Hay fever follows a seasonal calendar tied to whatever you’re allergic to. In the United States, the general pattern is:
- February through April: Tree pollen (some southern regions start as early as December or January)
- April through early June: Grass pollen
- August through the first hard frost: Weed pollen, especially ragweed
If your symptoms flare only in spring, tree pollen is the likely culprit. If they stretch from spring into summer, grass is probably involved. Fall symptoms almost always point to weeds. Some people react to multiple pollen types and feel symptomatic for most of the year. Others have perennial (year-round) hay fever triggered by indoor allergens like dust mites, pet dander, or mold, which don’t follow any seasonal pattern at all.
Symptoms tend to be worst on dry, windy days when pollen counts are high and better on rainy days, when moisture pulls pollen out of the air.
Complications of Ongoing Symptoms
Hay fever isn’t dangerous in the way an infection is, but it can quietly erode your quality of life and set the stage for secondary problems if left unmanaged over months or years.
Poor sleep is one of the most common consequences. Nasal congestion makes it hard to fall asleep and stay asleep, leading to daytime fatigue and that general run-down feeling that makes everything harder. Many people with hay fever report lower productivity at work and miss more days of school or their job during peak pollen season.
Prolonged congestion can also block the sinuses, creating conditions where bacteria thrive. This raises the risk of sinus infections, which bring facial pain, pressure, and thicker, discolored mucus. In children, persistent congestion is a contributing factor in middle ear infections. And for anyone with asthma, hay fever reliably worsens coughing, wheezing, and shortness of breath. The two conditions share overlapping immune pathways, so controlling one helps control the other.
Getting a Diagnosis
If your symptoms follow a clear seasonal pattern and respond to over-the-counter antihistamines, you may not need formal testing. But if you can’t identify your trigger, or if your symptoms are severe enough to interfere with daily life, allergy testing can pinpoint exactly what’s causing the reaction.
The most common method is a skin prick test. A healthcare provider places tiny amounts of suspected allergens (pollen extracts, pet dander, dust mite proteins) on your forearm or back, then lightly pricks the skin so each substance enters just below the surface. If you’re allergic, a small raised bump appears at that spot within about 15 to 20 minutes. The test can check for reactions to up to 50 substances in one visit and is considered reliable for airborne allergens.
For people who can’t do skin testing, perhaps because of a skin condition or certain medications, a blood test measuring allergen-specific antibodies provides similar information, though results take longer to come back.
Managing Symptoms
Most people start with over-the-counter antihistamines, which block the histamine your immune cells release and reduce sneezing, itching, and runny nose. Newer antihistamines cause less drowsiness than older formulations. Nasal steroid sprays are particularly effective for congestion because they reduce inflammation directly where it’s happening. They work best when you start using them a week or two before your usual symptom season begins, rather than waiting until you’re already miserable.
Simple environmental strategies also make a meaningful difference. Keeping windows closed during high pollen days, showering and changing clothes after spending time outdoors, and using air conditioning with a clean filter all reduce the amount of pollen that reaches your nose and eyes. Saline nasal rinses can physically flush out pollen and thin mucus.
If over-the-counter options aren’t enough, prescription nasal sprays, stronger antihistamines, or immunotherapy (allergy shots or sublingual tablets) can help retrain your immune system to tolerate the allergen over time. Immunotherapy is the only approach that can change the underlying allergic response rather than just masking symptoms, and it typically requires a commitment of three to five years to see lasting results.