Allergy shots work like a vaccine. Your body responds to injected amounts of a particular allergen, given in gradually increasing doses, by developing immunity or tolerance to the allergen.

The most common anaphylactic reactions are to foods, insect stings, medications and latex.

millions of pet owners have an allergy (allergic rhinitis) to their animals.

If you have asthma your airways are always inflamed. They become even more swollen and the muscles around the airways can tighten when something triggers your symptoms.

Bronchitis is a condition in which the airways in the lungs, called bronchial tubes, become inflamed and cause coughing, often with mucus. Bronchitis can be acute or chronic.

Most people recover within about 7-10 days. However, people with weakened immune systems, asthma, or respiratory conditions may develop serious illness, such as bronchitis or pneumonia.

Adverse reactions to medications are common, yet everyone responds differently. One person may develop a rash or other reactions when taking a certain medication, while another person on the same drug may have no adverse reaction at all.

Hives, also known as urticaria, affects about 20 percent of people at some time during their lives. It can be triggered by many substances or situations and usually starts as an itchy patch of skin that turns into swollen red welts.

Approximately 50% of people with latex allergy have a history of another type of allergy. Certain fruits and vegetables, such as bananas, chestnuts, kiwi, avocado and tomato can cause allergic symptoms in some latex-sensitive individuals.

Influenza (also known as “flu”) is a contagious respiratory illness caused by influenza viruses. It can cause mild to severe illness, and at times can lead to death. Learn about flu symptoms, complications, and diagnosis.

Is it painful to swallow? Or is your throat scratchy? You likely have a sore throat that’s caused by a virus.

If you have nasal congestion, facial pressure, cough and thick nasal discharge, you may have rhinosinusitis, commonly referred to as sinusitis.

For a small number of people with venom allergy, stings may be life-threatening.