Hay fever, also known as allergic rhinitis, causes cold-like symptoms such as a runny nose, congestion, sneezing and sinus pressure. But unlike a cold, hay fever isn't caused by a virus, but by an allergic response to indoor or outdoor airborne allergens, such as pollen, dust mites or pet dander.

The doctor will perform physical tests such as skin prick test and allergy blood test.

Medications for hay fever include nasal corticosteroids, oral corticosteroids, antihistamines, decongestants, cromolyn sodium, leukotriene modifiers, and nasal atropine.

Signs and symptoms of hay fever typically develop immediately after exposure to specific allergy-causing substances (allergens) and can include: runny nose and nasal congestion; watery or itchy eyes; sneezing; coughing; itchy nose, roof of mouth, or throat; sinus pressure and facial pain; swollen, blue-colored skin under the eyes; and decreased sense of smell or taste.

During a process called sensitization, the immune system mistakenly identifies a harmless airborne substance as something harmful. The immune system then starts producing allergy-causing antibodies. The next time a person comes in contact with the substance, these antibodies recognize it and signal the immune system to release chemicals such as histamine into your bloodstream. These immune system chemicals cause a reaction that results to the irritating signs and symptoms of hay fever. Hay fever can be triggered by either seasonal or year-round allergens. Many people have allergy symptoms all year long, but their symptoms worsen during certain times of the year.