• Seasonal sinus allergies. This allergy, also known as “hay fever”, is the most common. Symptoms include: sneezing, runny nose, nasal congestion, itchy, watery eyes and itchy mouth, ears and throat. Exposure to pollen and dust mites can trigger hay fever or seasonal allergies. Dust mites are microscopic organisms that live in house dust, a mixture of potentially allergenic materials including fibers from different fabrics, dandruff from animals, bacteria, mold or fungus spores.