The reasons for this are largely unexplained, but one widely held hypothesis is the 'hygiene hypothesis'.

• Foods: Peanuts, tree nuts, fish and shellfish, milk, eggs, soy products
• Insect stings: Bee venom, wasp venom
• Chemicals, drugs and other foreign proteins: Penicillin and other antibiotics, intravenous anaesthetic agents, latex
• Anaphylactoid: Opiates, aspirin, radiocontrast media
• Physical: Exercise, cold 
• Idiopathic: No cause can be identified in 30% of patients with anaphylaxis

Allergy is condition which brings some pathological outcomes. Visible changes due to various allergic reactions are

• Allergic rhinitis, also known as hay fever, causes irritation of the nose, sneezing, itching, and redness of the eyes.
• Asthmatic: shortness of breath ( dyspnea ), coughing and wheezing.
• Symptoms of food allergy include abdominal pain, bloating, vomiting, diarrhea, itchy skin, and swelling of the skin during hives
• Skin allergies frequently cause rashes, or swelling and inflammation within the skin, in what is known as a "wheal and flare" reaction characteristic of hives and angioedema.

The incidence of allergic diseases is increasing in both industrialised and non-industrialised countries. Factors contribute to the development of allergic diseases

Improvements in sanitation and health care
Family history. A number of genes contribute to disease susceptibility
Environmental factors such as pollutants and cigarette smoke, and the incidence of bacterial and viral infection

There are several methods to diagnose allergy. Three common methods are-

• Measurement of acute and convalescent serum mast cell tryptase concentrations may be useful to confirm the diagnosis.
• Anaphylactoid reactions
• Specific IgE tests may be preferable to skin prick tests when investigating patients with a history of anaphylaxis. 

Some natural cures may be applicable for allergies. You may get some important information about some of the herbal medication from the video files of this segment.

Disclaimer: strengthessence.com does not involve with any third party for their publicity. There can be more herbal medicine in order to treat allergy.Strengthessence.com does not endorse any of the treatment described here, they are for information purposes only.