Hay fever causes sneezing, a runny or stuffy nose, itchy eyes, and a scratchy throat. These symptoms appear when your immune system overreacts to airborne allergens like pollen, dust mites, or pet dander. Roughly 10 to 20 percent of people experience hay fever at some point, making it one of the most common chronic conditions worldwide.
Core Nasal Symptoms
The nose takes the biggest hit. Most people notice a combination of congestion, sneezing fits, and a runny nose that produces thin, clear, watery mucus. The congestion happens because allergens trigger your immune cells to release chemicals that make blood vessels in the nasal lining swell and leak fluid. This swelling can build sinus pressure, leading to headaches and a heavy, full feeling across your forehead and cheeks.
An itchy nose is another hallmark. In children especially, this leads to what doctors call the “allergic salute,” a repeated upward rubbing of the nose with the palm. Postnasal drip, where excess mucus slides down the back of the throat, often causes a sore throat and a persistent cough that can be worse at night or first thing in the morning.
Eye Symptoms
Itchy, red, watery eyes affect most people with hay fever. The clear membrane covering the white of your eye becomes inflamed, turning pink or red and sometimes swelling enough to give the eye surface a puffy appearance. The discharge is typically thin and watery, though it can occasionally turn stringy. Both eyes are usually affected at the same time, and rubbing them tends to make the itching worse rather than better.
Dark circles under the eyes, sometimes called “allergy shiners,” are another visible sign. These aren’t from lack of sleep. They develop because chronic nasal congestion restricts blood flow from the small veins beneath the eyes, causing the skin there to darken.
Less Obvious Symptoms
Beyond the classic sneezing and itching, hay fever causes a few symptoms people don’t always connect to allergies:
- Fatigue. Congestion disrupts sleep, and the immune response itself drains energy. Many people describe a foggy, run-down feeling throughout allergy season.
- Coughing and wheezing. Postnasal drip irritates the airways, and the same inflammatory chemicals that swell nasal tissue can tighten the airways in the lungs, making breathing feel harder.
- Ear pressure or popping. Swollen nasal passages can block the small tubes connecting your throat to your middle ear, creating a plugged sensation.
How Hay Fever Differs From a Cold
The overlap between hay fever and a common cold trips people up every year. Both cause sneezing, congestion, and a runny nose. A few differences help you tell them apart.
Timing is the biggest clue. A cold typically runs its course in 3 to 10 days. Hay fever symptoms last as long as you’re exposed to the allergen, which can mean several weeks during pollen season or year-round if the trigger is something like dust mites. Onset matters too: cold symptoms build gradually over a day or two, while hay fever symptoms can flare within minutes of allergen exposure.
Itching is almost always allergies. Colds rarely make your eyes, nose, or throat itch. A fever and body aches point toward a cold or other infection, not hay fever (despite the name, hay fever doesn’t actually cause a fever). And the mucus itself offers a hint. Hay fever mucus stays clear and watery. Cold mucus often thickens and turns yellow or green after a few days.
Symptoms in Children
Children develop the same core symptoms as adults, but they express and show them differently. Young kids may not describe an itchy nose or throat. Instead, you’ll notice habitual nose rubbing, mouth breathing, sniffling, and frequent throat clearing. Allergy shiners are more prominent in children and can make parents worry about sleep problems or illness when allergies are the real cause.
Children with ongoing hay fever are also more prone to middle ear infections. The same swelling that blocks sinuses can trap fluid behind the eardrum, creating a breeding ground for bacteria. Repeated ear infections in a child with nasal symptoms are worth evaluating for underlying allergies.
What Happens When Symptoms Persist
Hay fever that goes unmanaged season after season can lead to secondary problems. Prolonged sinus congestion raises the risk of sinusitis, an infection or inflammation of the sinus cavities that brings thicker discharge, facial pain, and sometimes a low fever. People with hay fever are also more likely to develop or worsen asthma. The inflammatory pathway that swells nasal tissue operates in the lungs too, and chronic allergic inflammation in the nose is closely linked to airway sensitivity lower down.
Sleep quality takes a real hit as well. Chronic congestion forces mouth breathing at night, which fragments sleep and contributes to daytime fatigue, poor concentration, and irritability. In children, this can affect school performance. In adults, it can mimic or worsen symptoms of sleep disorders.
Seasonal vs. Year-Round Patterns
The timing of your symptoms reveals a lot about what’s triggering them. Seasonal hay fever follows a predictable calendar. Tree pollen peaks in early spring, grass pollen in late spring and early summer, and ragweed or other weed pollens in late summer through fall. If your symptoms reliably appear during one of these windows and vanish afterward, a seasonal pollen is the likely cause.
Year-round (perennial) hay fever produces the same symptoms but without a clear season. Triggers include dust mites, mold spores, cockroach particles, and pet dander. Symptoms tend to be more constant but milder, with congestion and postnasal drip dominating over the dramatic sneezing fits of seasonal flare-ups. Some people have both types, experiencing a baseline of mild symptoms that spike during pollen season.