Some allergies you can easily diagnose. Hay fever, for example, is one type of allergy sufferers can usually identify on their own. Spring or fall rolls around, the plants begin to pollinate, and coughing and sneezing starts to get out of control. Sure, you may not know which plant or tree causes your symptoms, but you’re pretty certain you are reacting to the pollen in the air. Pet allergies are another one that’s fairly easy to pinpoint. Every time a cat or dog approaches,