Symptoms of seasonal allergies will vary depending on how the allergen comes into contact with the body. The most common methods is for an allergen (such as pollen) to be inhaled through the nose into the upper respiratory system. There, it triggers swelling in the sinuses and in the passage leading from the throat to the middle ear in people sensitive to that allergen. This inflammation is called allergic rhinitis (hay fever) or allergic sinusitis depending on the location of the inflammation. Symptoms commonly associated with these conditions include:

• Frequent and prolonged sneezing
• Itchy and runny nose
• Congestion
• Red, watery or itchy eyes
• Coughing

At times, the allergen can come into direct contact with eye membranes, causing inflammation – a condition known as allergic conjunctivitis. This results in a variety of eye-related symptoms. If these symptoms intensify with exposure to wind, dust, bright light, hot weather or physical exertion, it may indicate a form of allergic conjunctivitis called vernal conjunctivitis.

Seasonal allergies may also trigger skin rashes in some people, such as hives or contact dermatitis. Reactions that involve two or more body systems are called anaphylaxis and can lead to potentially life-threatening anaphylactic shock. Though rare in relation to seasonal allergies, anyone experiencing an allergic reaction that involves more than one area of the body or difficulty breathing should seek immediate medical attention.

Seasonal allergy symptoms often vary in severity depending on the individual and the environment. However, they will usually last throughout an entire season. The most severe cases are considered extremely uncomfortable and can make it difficult to carry out even everyday tasks.