Allergy symptoms depend on your particular allergy, and can involve the airways, sinuses and nasal passages, skin, and digestive system. Allergic reactions can range from mild to severe. In some severe cases, allergies can trigger a life-threatening reaction in your body known as anaphylaxis. Hay fever, also called allergic rhinitis, may cause congestion, itchy, runny nose, Itchy, watery or swollen eyes (conjunctivitis).
