Allergy - too acute reaction of the body to various substances. Most of them are usually completely innocuous. After contact with the stimulus, chemical substances begin to be produced, among which there is histamine. This is what can be considered the main reason for the onset of allergy symptoms. An acute reaction can occur with tactile contact with the allergen, its inhalation, injection or ingestion.
Common causes of allergies and urticaria
To name one and only reason why a person may have an allergy is impossible. Developing ailment in each organism is very individual, and it depends on many different factors. There are even cases when an allergic reaction occurs against a background of stress or a strong emotional shock.
As practice shows, the most common causes of allergies are:
- dust;
- chemicals contained in cleaning products;
- latex;
- wool or saliva of pets;
- products of vital activity of different insects and arthropods;
- spores of fungi and mold;
- pollen;
- Food;
- foreign proteins that may be contained in vaccines;
- medicinal substances (in particular penicillin).
Causes of food allergy
Because of allergic reactions, some have to abandon the use of once-favorite foods. And this can happen because of:
- increase the permeability of the walls of the intestine, as it happens in diseases of the gastrointestinal tract;
- erratic feeding;
- dyskinesia ;
- insufficient pancreatic function.
Causes of cold allergies on the skin
It is not so common, but the cold allergy also exists. The problem usually arises from violations of the body's defenses. The reason can be in:
- helminthic invasions;
- infectious mononucleosis;
- measles;
- rubella;
- lupus erythematosus ;
- blood cancer;
- diseases of the thyroid gland.