Allergy - a sharp reaction of the immune system to normally harmless substances. Symptoms of allergy can occur in different parts of an organism, observed from several minutes to several days, and to be very different in severity.
Allergy can occur on hair of some animal species, different products, dust, medicines, chemicals, insect stings and flower pollen. Substances that cause an allergy, called allergens. In some cases, allergic reactions are so weak that you can not even be aware that generally suffer from allergies.
But allergies can be, on the contrary extremely dangerous and even life threatening. People suffering from allergies, may arise anaphylactic shock- severe pathological condition associated with an extremely sharp reaction to the allergen. Anaphylactic shock can be caused by various allergens: drugs, insect bites, food. Also anaphylactic shock can occur due to contact of the skin with an allergen, such as latex.
A food allergy is an immune reaction caused by certain foods and accompanied by well-known symptoms. A food allergy occurs when the body by mistakenly thinks that some product is a threat to the body and for self-defense makes the immune system to produce antibodies. At repeated reception of allergen immune system is quickly learns the substance and immediately reacts by producing antibodies again. Exactly these substances and cause allergic symptoms. Food allergies are almost always develops in this way.
In some cases in adults pass allergy observed in childhood. But if the allergy manifested itself only in adulthood, get rid of it very difficult. Allergic a runny nose (specialists call this state rhinitis), or hay fever, occurs in one person out of 10 and is often hereditary. People with other allergic diseases, such as asthma or eczema often suffer from allergic rhinitis. Such allergies are more common in women than in men. At allergic rhinitis may appear the following symptoms: itchy eyes, throat, nose and on the palate, sneezing, and stuffy nose, watery eyes, mucus from the nose, conjunctivitis (redness and pain in the eyes). In severe cases of allergic rhinitis can trigger an asthma attack (in people suffering from asthma) and / or eczema.
Causes of allergies:
In some people, the immune system reacts to certain substances (allergens), producing a variety of chemicals. One of them, histamine, causes allergic symptoms. The reaction of the body may arise through inhalation, skin contact, administration of allergen or receiving it in food. Allergens can be animal hair, fluff, dust, foods, cosmetics, drugs, pollen, cigarette smoke.
Symptoms of allergy:
An allergic reaction can occur in different parts of the body, and the symptoms can last from a few minutes to several days.
In the absence of medical care severe allergy can be fatal.