Latex allergies present a moderate to serious health problem for a very small percentage of the population.  Reactions to naturally produced latex may range from minor skin irritation to reactions so severe that immediate emergency medical treatment is required to prevent death.  Those most at risk of having an allergic reaction to latex are in the medical field - doctors, nurses, dentists, technicians and certain patients.  These people are exposed to latex gloves and equipment which has latex on it. You are not likely to experience a latex allergy for the first time at a fun event with balloons. In most cases, you will know about a latex allergy you have from a past experience in a medical setting.