An allergy is a hypersensitivity disorder of the immune system. Allergic reactions occur when a person's immune system reacts to normally harmless substances in the ...

Pollen is a fine to coarse powder containing the microgametophytes of seed plants, which produce the male gametes (sperm cells). Pollen grains have a hard coat that ...

Learn about pollen allergies, which types of plants (grasses, weeds) and trees (oak, elm) produce allergenic pollen, and the seasonal nature of pollen allergy.

Causes, incidence, and risk factors. Allergies are pretty common. Both genes and environmental factors play a role. The immune system normally protects the ...

An allergy is an exaggerated immune response or reaction to substances that are generally not harmful. Allergies are pretty common. Both genes and ...

An overview of allergies: symptoms, diagnosis, treatment and management written and reviewed by leading experts in allergy, asthma and immunology.

Your eyes itch, your nose is running, you're sneezing, and you're covered in hives. The enemy known as allergies has struck again.

Featured Image. Picture of Psoriasis. A reddish, scaly rash often located over the surfaces of the elbows, knees, scalp, and around or in the ears, navel, genitals or ...

AAAAI, the experts in allergy and immunology, provide an overview allergy shots.

Allergy information includes articles on allergies, symptoms, treatment, medications, food allergies, and allergy relief.

Millions of people suffer from allergies. There are different types of allergies, but one of the most common is a pollen allergy, also known as hay fever. Certain ...

Pet allergy — Comprehensive overview covers symptoms and treatment of allergy to some pets.

Most everyone has an idea of what allergies are, but an allergist's definition of an allergy is quite different. Dr. Daniel More, a board-certified ...

Brief and Straightforward Guide: What is an Allergy? ... An allergy is an immune system response to a substance the body perceives as harmful.

The term allergy is used to describe a response, within the body, to a substance, which is not necessarily harmful in itself, but results in an immune response and a ...

Nasal allergies and asthma are similar conditions in different parts of the body. As many as 78% of asthma patients have nasal symptoms. As many as 38% of nasal ...