Hay fever causes sneezing, a runny or stuffy nose, itchy eyes, and a scratchy throat. About 25% of American adults and 21% of children have seasonal allergies, making it one of the most common chronic conditions. While the core symptoms are familiar, hay fever can also cause less obvious problems like fatigue, poor sleep, ear pain, and persistent coughing that people don’t always connect to allergies.
The Main Symptoms
The hallmark signs of hay fever center on the nose, eyes, and throat. Nasal congestion, sneezing fits, and a clear, watery runny nose are typically the first things people notice. Your nose and the roof of your mouth may feel intensely itchy. Many people also experience increased mucus dripping down the back of the throat, which can lead to a sore throat and a nagging cough.
Eye symptoms are just as common. Itchy, red, and watery eyes are a near-universal feature of hay fever. Some people develop dark circles under their eyes, sometimes called “allergic shiners,” caused by blood pooling from chronic nasal congestion. Headaches and a feeling of pressure around the sinuses and forehead round out the typical picture.
Symptoms You Might Not Expect
Hay fever doesn’t stop at sneezing and itchy eyes. A persistent cough is one of the most overlooked symptoms. It’s caused by mucus dripping from the back of the nose down the throat, a process called postnasal drip. This cough can linger for weeks during allergy season and is sometimes mistaken for a chest infection.
Ear pressure and earache also occur, particularly in children, who can develop middle ear infections as a direct result of hay fever. The inflammation and swelling from allergies can block the small tubes connecting the back of the throat to the middle ear, trapping fluid behind the eardrum. Wheezing and difficulty breathing are possible too, especially in people who also have asthma.
Why Hay Fever Makes You Tired
One of the most disruptive effects of hay fever is fatigue, and it’s not just from the medication. Nasal congestion worsens at night because the inflammatory response naturally intensifies during sleep hours. That congestion fragments your sleep, forcing you to breathe through your mouth and waking you repeatedly throughout the night, even if you don’t fully remember it in the morning.
The result is daytime drowsiness, difficulty concentrating, and reduced productivity at work or school. Research shows that hay fever impairs learning ability and work performance independent of any medication side effects. Many people blame their antihistamines for making them groggy, but the sleep disruption from congestion itself is often the real culprit.
What Happens Inside Your Body
When you inhale pollen or another allergen, your immune system treats it as a threat. Your body produces antibodies that latch onto specialized immune cells, and when pollen lands on the lining of your nose, those cells release histamine. Histamine triggers nerve endings in the nose, causing sneezing and itching. It also causes blood vessels in the nasal lining to swell and leak fluid, which is why your nose feels blocked and runs constantly.
That’s only the first wave. Four to six hours after exposure, a second phase kicks in. Your body sends a flood of inflammatory cells into the nasal tissue, deepening the swelling and congestion. This delayed response explains why symptoms can worsen throughout the day or peak hours after you’ve come indoors, even though you’re no longer around pollen.
How to Tell It Apart From a Cold
Hay fever and the common cold share several symptoms, which is why people sometimes confuse them. The quickest way to tell the difference is fever: colds can cause a low-grade fever, flu typically causes a high fever (100 to 102°F or higher), but hay fever never causes a fever. If your temperature is normal, allergies are more likely.
Timing and pattern matter too. A cold runs its course in 7 to 10 days. Hay fever persists for as long as you’re exposed to the allergen, which can mean weeks or months during pollen season. Itchiness is another reliable clue. Itchy eyes, nose, and throat are classic allergy signs that rarely accompany a cold. And if your symptoms appear at the same time every year or flare up in specific environments, that pattern points strongly toward hay fever.
Signs of Hay Fever in Children
Children experience the same core symptoms as adults but show some distinctive physical signs. The “allergic salute” is a repeated upward rubbing of the nose with the palm of the hand, driven by intense nasal itching. Over time, this motion can create a visible crease across the bridge of the nose. Allergic shiners, those dark circles under the eyes, are another visual marker that’s especially noticeable in kids.
Children with hay fever are also more prone to middle ear infections. Because their ear drainage tubes are smaller and more horizontal than in adults, the swelling from allergies blocks them more easily. Repeated ear infections in a child with other allergy symptoms are worth flagging to a pediatrician, since treating the underlying hay fever can reduce their frequency.
When Symptoms Signal Something More
Untreated hay fever can lead to complications over time. Chronic nasal congestion and inflammation increase the risk of sinus infections, which cause facial pain, thick discolored mucus, and a reduced sense of smell. People with hay fever also have a higher chance of developing asthma compared to those without it, and existing asthma tends to worsen during allergy season.
Certain symptoms suggest something beyond typical hay fever and warrant further evaluation: a persistent blockage in only one nostril, loss of smell or hearing, nasal polyps, or ongoing sinus problems that don’t respond to standard allergy treatment. These can indicate structural issues or chronic sinusitis that need separate management.