What Causes Seasonal Allergies and How Can You Manage Them?

Seasonal allergies can make spring walks, summer yardwork, or fall weather feel less enjoyable. Sneezing, itchy eyes, congestion, and a runny nose may return around the same time each year, leaving many people wondering what causes seasonal allergies and why symptoms seem to change from one season to the next.

Short answer: Seasonal allergies happen when the immune system reacts to airborne allergens, such as pollen or mold spores, as if they are harmful. This reaction can cause inflammation in the nose, eyes, throat, and sinuses. Seasonal allergies are one type of allergy, and symptoms can vary depending on the person, season, and trigger.

What Causes Seasonal Allergies?

Seasonal allergies, also called seasonal allergic rhinitis, are usually triggered by allergens that rise and fall during certain times of year. When a person with allergies breathes in pollen or mold spores, the immune system may release chemicals such as histamine. Histamine can contribute to sneezing, itching, nasal congestion, watery eyes, and postnasal drip.

Despite the name “hay fever,” seasonal allergies are not caused by hay and usually do not cause fever. Symptoms often affect the nose and eyes, although some people also notice coughing, throat clearing, sinus pressure, or fatigue.

Why Do Seasonal Allergies Happen?

Many people ask, “Why do seasonal allergies happen every year?” The answer often depends on which allergens are in the air. Tree pollen is more common in early spring. Grass pollen often rises in late spring and summer. Weed pollen, including ragweed, is common in late summer and fall. Mold spores may increase during warm, humid weather or after rain.

Weather can also affect symptoms. Windy, warm days can spread pollen more easily, while rain may briefly clear pollen from the air. In some cases, pollen levels can rise again after rainfall. Checking local pollen counts may help people plan outdoor activities during allergy season.

Common Allergy Triggers to Watch For

Common allergy triggers include tree pollen, grass pollen, weed pollen, mold spores, dust mites, pet dander, and cockroach particles. Seasonal allergies are most closely linked with outdoor triggers, but indoor allergens can make symptoms worse or cause year-round allergy symptoms.

Tracking symptoms can be helpful. Consider noting when symptoms start, whether they worsen outdoors, and whether they improve when windows are closed or after using air conditioning. This information can help a healthcare provider decide whether allergy testing or a treatment plan may be useful.

How Seasonal Allergy Symptoms May Be Managed

Avoiding triggers is often the first step. During high pollen days, consider keeping windows closed, showering after being outdoors, changing clothes after yardwork, and using air conditioning when possible. These steps may not prevent every symptom, but they can help reduce exposure.

Treatment options may include oral antihistamines, antihistamine eye drops, saline nasal rinses, decongestants, and seasonal allergy medications such as nasal sprays. Nasal corticosteroid sprays may help reduce inflammation and congestion when used as directed.

Some allergy medicines may not be appropriate for everyone. This is especially important for older adults and people with high blood pressure, glaucoma, prostate problems, heart conditions, or those taking multiple medications. A healthcare provider or pharmacist can help determine which option may be appropriate.

Canada Pharmacy offers access to many allergy-related medications, where appropriate, with online ordering and home delivery. If symptoms are severe, affect sleep, worsen breathing, or do not improve with usual treatments, speak with a licensed healthcare professional.

Seasonal allergies can be frustrating, but understanding your triggers can make allergy season easier to manage. This article is for general educational purposes and does not replace professional medical advice.

FAQs

Seasonal allergies are most often caused by pollen from trees, grasses, and weeds. Mold spores can also trigger symptoms, especially in warm, damp, or humid conditions.

Adults can develop allergies later in life. Symptoms may appear after moving to a new region, spending more time outdoors, or being exposed to higher levels of pollen, mold, or other allergens.

No. Seasonal allergies are an immune reaction to allergens, while colds are caused by viruses. Allergies often cause itching and may return around the same season each year. Colds are more likely to include body aches or fever.

Common indoor triggers include dust mites, pet dander, mold, cockroach particles, and other household allergens. These triggers may cause year-round symptoms or make seasonal symptoms worse.

Talk to a healthcare provider if allergy symptoms interfere with sleep, breathing, or daily activities, or if over-the-counter treatments are not helping. Do not stop or change prescribed medication without speaking with your healthcare provider.