Name it:
People can be allergic to all kinds of different substances, from pollen to pet fur and base metals, household dust, certain foods and medicines. 
 

Know it:
Your body's immune system is designed to protect you from infection. When a harmful substance (i.e. a virus or bacteria) enters the body of someone with a sensitized immune system, antibodies quickly arrive to begin the process that deals with it. Symptoms of this immune process can include itching, coughing, wheezing, hives and rashes, but it's a small price to pay for potentially saving your life. With allergies, the system mistakes otherwise harmless substances for something more dangerous, and triggers the immune response. 
 

Recognise it:
Symptoms vary from one person to the next, but a great deal depends upon the type of allergy and individual levels of sensitivity. Generally, the area of the body where the allergen has come into contact is most affected. For example, the runny nose and itchy eyes that crop up with hay fever is associated with inhaling pollen, while an allergic reaction to an insect bite could cause the surrounding tissue to swell up. Always consult your GP if the symptoms persist, or if breathing difficulties kick in. 
 

Treat it:
There is no medical 'cure' for allergies, but you can often avoid the substance responsible, and the symptoms can still be treated. Antihistamines may help reduce some of the effects of an allergic reaction, but always talk it over with your GP or pharmacist first.