You known youre allergic when you react to certain substances youve been exposed to before. For instance, you may have eaten shellfish before but the next time you eat foods containing shellfish, you develop rashes.
An allergy occurs when your body overreacts to things that dont normally cause problems for most people. These things are called allergens and your bodys overreaction to them are what causes allergy symptoms.
Common Allergy Symptoms are:
Runny nose