Signs and symptoms of hay fever can range from mild to severe. If your condition is mild, you may have brief, infrequent episodes of a runny nose and itchy, watery eyes. At the other extreme, you may have persistent, severe symptoms that last more than four days a week or longer than four weeks at a time. Chronic congestion may cause facial pressure and pain, alter your sense of taste and smell, and affect your appearance. The skin under your eyes may swell and turn bluish as you develop what are sometimes called "allergic shiners."

Hay fever symptoms usually develop immediately after you're exposed to specific allergy-causing substances (allergens). Common allergens include pollen, dust mites, cockroaches, mold and pet dander. Sometimes, exposure to irritants such as perfume and tobacco smoke can trigger or worsen symptoms.

Signs and symptoms of hay fever may include:

Runny nose

Watery eyes

Congestion

Frequent sneezing

Itchy eyes, nose, roof of mouth or throat

Swollen, blue-colored skin under the eyes (allergic shiners)

Cough

Facial pressure and pain

Hay fever can also cause:

Sleeplessness

Fatigue

Irritability

It may be difficult to distinguish hay fever from a cold. Here's how to tell the difference:

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