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Hay fever, also called allergic rhinitis, causes cold-like symptoms. These may include a runny nose, itchy eyes, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn't caused by a virus. Hay fever is caused by an allergic response to a harmless outdoor or indoor substance the body identifies as harmful (allergen).
Common allergens that can trigger hay fever symptoms include pollen and dust mites. Tiny flecks of skin shed by cats, dogs, and other animals with fur or feathers (pet dander) als...

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Hay fever symptoms can include:
- Runny nose and nasal stuffiness (congestion)
- Watery, itchy, red eyes (allergic conjunctivitis)
- Sneezing
- Cough
- Itchy nose, roof of mouth or throat
- Mucus that runs down the back of your throat (postnasal drip)
- Swollen, bruised-appearing skin under the eyes (allergic sh...

When you have hay fever, your immune system identifies a harmless airborne substance as being harmful. This substance is called an allergen. Your immune system is how your body protects itself, so it produces immunoglobulin E (IgE) antibodies to protect against this allergen. The next time you come in contact with the allergen, these antibodies signal your immune system to release chemicals such as histamine into your bloodstream. This causes a reaction that leads to the symptoms of hay fever....

Once you know what you're allergic to, you and your health care provider can develop a treatment plan to reduce or get rid of your hay fever symptoms.
It's best to limit your exposure to substances that cause your hay fever. If your hay fever isn't too severe, medications you can buy without a prescription may be enough to relieve symptoms. For worse symptoms, you may need prescription medications.
Many people get the best relief from a combination of aller...

There's no way to avoid getting hay fever. If you have hay fever, the best thing to do is to lessen your exposure to the allergens that cause your symptoms. Take allergy medications before you're exposed to allergens, as directed by your health care provider.

For informational purposes only and not a substitute for professional medical advice, diagnosis, or treatment.