Seasonal allergies are immune reactions to pollens, molds, or other triggers that are present for only one season or part of the year. This type of allergy can affect any person of any age in any location. Generally, pollen from trees, grasses, weeds or molds trigger seasonal allergies. Seasonal allergies cause a variety of symptoms, such as itchy eyes and nose, headaches, sore throats and sneezing. Symptoms often disrupt daily life and cause considerable discomfort. Rarely, seasonal allergies may cause severe, life-threatening allergic reactions or asthma attacks. Prevention is key, but treatments are available, including antihistamines, corticosteroids, and immunotherapy for severe cases.